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Fungi Affecting Wall Paintings of Historical Value
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Wall paintings have been a cultural expression of human creativity throughout history. Their degradation or destruction represents a loss to the world’s cultural heritage, and fungi have been identified as a major contributor to their decay. For this reason, is of utmost importance to know the species involved, their distribution, the method used for their identification, and the possible relation with the environment.

frescoes deterioration fungal diversity fungal ecology hypogean conservation mural paintings biodeterioration subterranean cultural heritage deterioration wall paintings conservation
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Subjects: Microbiology
View Times: 154
Revisions: 2 times (View History)
Update Date: 06 Apr 2022
Table of Contents

    1. Introduction

    Wall paintings are among the most representative elements of figurative artworks and have been developed by human creativity since prehistoric times [1]. Their technique of execution requires a layered structure consisting of a support, a ground, and a paint layer, which changed over time across different cultures (secco, such as tempera, or frescoes) [2]. In secco technique, which is the earliest, the preparation layers are applied, but the colors remain on the surface, whereas in the frescoes the colors are applied before the mortar dries, allowing their in-depth penetration [2]. The employed colors usually have a mineral origin, but some pigments can also be derived from plants. Organic compounds can later be added during restoration or because of other human activities (e.g., firing candles in the churches) [3].

    The observed deterioration phenomena of mural paintings depend largely on the materials used and the environmental conditions [4]. Humidity, lighting, temperature, ventilation, and nutrients select the occurring biological agents [1][5]. Organisms belonging to all domains such as bacteria, algae, fungi, arthropods and in a lesser extent lichens, mosses, ferns, and higher plants, have been found on the surfaces of mural paintings [4][6]. Indeed, given the indoor conditions of most mural paintings, photoautotrophs are limited, while fungi and bacteria are more frequent [7]. Bacteria with reduced nutritional needs have been often suggested to be the first colonizers. Fungi, due to their large assortment of enzymes and the remarkable ability to thrive in a wide range of environmental conditions, have been recognized as the most common cause of biodeterioration of painted surfaces and other artworks [1][8][9][10].

    The damage is generally due to the mycelial growth on the substrate, hyphal penetration, and fruiting bodies production onto and into the substrate, all of which increase the volume and number of cracks in the pigment layer and lead to surface fragments detachments [1][11]. Fungal colonization generally starts on the surface and then moves in-depth, up to decreasing painted layer cohesion and cause exfoliations and loss of the paint [12][13]. A study carried out by Dornieden and colleagues demonstrated that some fungi, such as the so-called microcolonial black fungi, are among the most dangerous for cultural heritages and can influence the resistance to shear and torsion stress of mortar and marble, contributing to the separation of different layers of material in mural paintings [14]. Aesthetic damages are also frequent, due to pigment discolorations, mycelial pigmentation, and/or the release of organic pigments of different colors, depending on the species involved. Extracellular enzymes and/or organic acids are generally released into the substrate from fungal hyphae causing chemical alterations of the mineral constituents of the surfaces as well as the original pigments [12][13]. The secretion of organic acids (e.g., oxalic, citric, succinic, formic, malic, acetic, fumaric, glyoxylic, gluconic, and tartaric acids) can cause dissolution of cations and chelation of metal ions from mortar and mineral pigments, leading to the formation of stable metal complexes whose crystallization causes an increase of internal pressure resulting in cracking, peeling, and the eventual loss of mural fragments [15].

    Awareness of microorganisms' considerable role in preserving art objects and historical buildings dates back to the 1950s [16]. Ionita and colleagues provided one of the first detailed descriptions of the mycoflora involved in the deterioration of mural paintings of monasteries in Moldavia, noting that it was favoured by the various nutritional sources present in the materials used for the realization of the frescoes and by local environmental parameters [16]. This was perhaps one of the first statements of the importance of interdisciplinary studies to prevent and control deterioration processes and define restoration and preservation strategies.

    Despite the fact that the fungal role in the deterioration of frescoes has been documented by several papers, a global inventory of fungal diversity and their optimal settlement conditions is not yet available. These paintings are mainly present in confined and semi-confined environments, both hypogean and non-hypogean. A fungal alteration pattern dependent on the environmental conditions of these different sites was expected. Those present in hypogean environments are often subjected to a constant extreme humidity, promoting fungal spores germination and mycelial growth. The amount and type of available nutrients also affect the fungal growth rate and the type of fungal taxa. Nutrients may arrive from the external environment as airborne particles, and the more confined are the environments, the lower are the air spores dispersion phenomena. 

    2. Fungal Diversity on Wall Paintings

    Even if fungi have been suggested as secondary colonizers of painted mural substrates, they are among the most common microbial life-forms present in these environments and the primary cause of their biodeterioration [1][9][10]. The wide biodiversity observed confirms the potential key role of fungi in such colonization process and suggests a combination of causes that can favor their growth. Fungi recorded belonged to species found in natural environments like soils, plants, and air. A detailed survey of their diversity and distribution should become a prerequisite before any restoration measures in order to prevent further damages [17]. Most records belonged to Ascomycota, with Eurotiales as the most common order, due to the prevalence of Aspergillus and Penicillium genera. The former was one of the most frequently isolated genera, with A. flavus and A. niger among the more frequently recorded species. As reported in the literature, even from the first older papers in this field, these two genera, along with Alternaria, Fusarium, Cladosporium, Mortierella, Chaetomium, and Acremonium, are among the most common deteriogens of such paintings [1][18][11][19][17][20][21][22][23][24]. These taxa are ubiquitous, and their frequent occurrence is due to the production of numerous airborne conidia. A diversity of filamentous fungi, with the most predominant genera Penicillium, Cladosporium, Aspergillus, and Trichoderma, were also isolated from mural paintings of the Parish Church of Santo Aleixo (Portugal) [25]. Species of these genera were recorded on indoor frescoes in Romanian monasteries; their presence was favoured by the organic components and vegetal pigments used, as well as high moisture levels caused by frequent rainwater penetration, which also resulted in the formation of efflorescences [26]. Cladosporium species can cope with various harsh environmental conditions thanks to their low nutritional requirements (i.e., in oligotrophic conditions). Otherwise, Chaetomium species are proteolytic and cellulolytic ascomycetes, favoured by nutrient-rich substrates [27][28][29]. They were reported as the most frequent microfungi on the frescoes of the St. Damian Monastery in Assisi (Italy) [20] and on frescoes in a Serbian church [27]. Furthermore, a community of Aspergillus, Penicillium, Cladosporium, and Chaetomium species was recorded from Medieval wall paintings in Styria (Austria), forming spots of different colors [17]. This group of genera was dominant on two deteriorating frescos in St Clare’s Refectory of the Monastery of St Damian in Assisi [20].

    Hypocreales was the second most abundant order, accounting for 18% of total fungal diversity, within which AcremoniumTrichoderma, and Fusarium were among the most common genera. Hypocreales is one of the largest orders of filamentous ascomycetes and exhibits a broad range of ecologies, ranging from plant-associated nutritional modes to animal pathogens (e.g., insect pathogens) and mycoparasites [30]Neocosmospora solani, recorded in Thailand, India, Japan, and France; Simplicillium lamellicola, recorded in Russia; and Clonostachys rosea [31][32], recorded in Japan, are examples of mycoparasitic species, while Parengiodontium album is an insect parasite and was recorded in several countries (Germany, Russia, Romania, Austria, Italy, and England) [33]. The recurrent presence of mites and insects pointed out their possible role in spreading fungi on painted surfaces [20][34].

    The plant pathogen species Fusarium oxysporum has been shown to produce an extracellular pinkish pigment that disfigures and aesthetically damages colonized mural paintings and stone surfaces with permanent stains [22].

    Phylum Basidiomycota was present with several occasional species, mostly represented by one or two records, and comprises litter, soil, and wood-saprotrophs, ectomycorrhizal, epiphyte, and plant-pathogen species. Their occurrence must be regarded as sporadic, potentially aided by root penetration. The possible role of roots as a carrier for rhizosphere microorganisms, like a dripping line for water condensation, and as an organic carbon source by root exudates has been hypothesized [35][36]. A Basidiomycete was also recorded at the entrance of Roman catacombs [37], possibly due to spores carried by water infiltrations and germinating using organic nutrients from the soil and/or the phototrophic biofilm.

    Mucoromycota was present with few species and records, and black meristematic fungi were also rarely recorded. These latter may grow on a wide range of substrates and are resistant to a variety of environmental stresses, as well as being widely distributed epi- and endolithically on monuments [38][39]. Although the biodiversity of black fungi on historical monuments is not fully elucidated, recent samplings indicate that they are also present on wall paintings and that their rare finding could be linked to the isolation protocols used, generally favoring fast-growing species [124]. Two new species of the genus Neodevrisia have been found in the restricted sampling area of the Vallerano cave, and another, still undescribed, from Maijishan grottoes [40][41][42]. Scolecobasidium lascauxensis and S. anomalus were isolated and described from black stains in Lascaux Cave, France [43][44], while the chaetothyrialean black fungi Cladophialophora, Exophiala, and Phialophora have been reported from different sites [45][46][47][48].

    Yeasts have been rarely reported, such as Saccharomycetales (Ascomycota) that usually grow by individual yeast cells or Rhodotorula spp. (Basidiomycota) often linked to pink/orange stains due to the release of carotenoids [25][49]. A complete list of species isolated from wall paintings has been reported by Zucconi and colleagues [link with Table 1]

    Table 1. List of the fungal entries retrieved from the different papers grouped by genera, in association with the corresponding references and the environmental categories where they have been registered.
    Genus Fungal Name References Environment
    Acremoniella Acremoniella atra [16] C-NHE
    Acremonium Acremonium camptosporum [50] NC-HE
    Acremonium charticola [51][17][52][53] NC-HE, C-NHE
    Acremonium masseei [45][54] C-HE
    Acremonium murorum
    (syn. Gliomastix murorum)
    [45][46][54][55][56] C-HE, NC-HE
    Acremonium rutilum
    (syn. A. roseum)
    [16] C-NHE
    Acremonium cf. rutilum [17] C-NHE
    Acremonium sp. [45][51][17][52][53][47][57][58][40][20][59] C-HE, NC-HE, C-NHE
    Acrodontium Acrodontium crateriforme [31] C-NHE
    Acrophialophora Acrophialophora fusispora
    (syn. A. nainiana)
    [55][56] NC-HE
    Acrostalagmus Acrostalagmus luteoalbus
    (syn. Verticillium lateritium)
    [60] C-NHE
    Acrothecium Acrothecium sp. [61] O-SPE
    Actinomucor Actinomucor elegans [62] C-HE
    Akanthomyces Akanthomyces lecanii
    (syn. Verticillium lecanii)
    [17][57][63] NC-HE, C-NHE
    Allophoma Allophoma labilis
    (syn. Phoma labilis)
    [64] SC-NHE
    Alternaria Alternaria alternata
    (syn. A. tenuis and Ulocladium alternariae)
    [16][65][55][66][19][56][52][20][60][62][64][67][26][68][35][32][69] All environments
    Alternaria angustiovoidea [70] C-NHE
    Alternaria chartarum
    (syn. Ulocladium chartarum)
    [16][71] C-NHE
    Alternaria dianthi [19] C-NHE
    Alternaria longipes [19] C-NHE
    Alternaria longissima [55][19][56] NC-HE, C-NHE
    Alternaria oudemansii
    (syn. Ulocladium oudemansii)
    [21] NC-HE, C-NHE
    Alternaria tenuissima [16][27][46][19][20][35][72] NC-HE, C-NHE, O-SPE
    Alternaria sp.
    (syn. Ulocladium sp.)
    [73][18][16][45][65][51][53][20][74][28] C-HE, NC-HE, C-NHE, O-SPE
    Amphinema Amphinema sp. [75] C-NHE
    Amyloporia Amyloporia sinuosa
    (syn. Antrodia sinuosa)
    [18] C-NHE
    Antrodia Antrodia sp. [75] C-NHE
    Apiotrichum Apiotrichum sp.
    (syn. Hyalodendron sp.)
    [57] C-NHE
    Arachnomyces Arachnomyces sp. [40] NC-HE
    Armillaria Armillaria sp. [75] C-NHE
    Arthrinium Arthrinium arundinis [52] C-NHE
    Arthrinium phaeospermum
    (syn. Papularia sphaerosperma)
    [55][56] NC-HE
    Arthrinium sp. [20][28] C-NHE; O-SPE
    Arthrobotrys Arthrobotrys sp. [45] C-HE
    Ascochyta Ascochyta medicaginicola
    (syn. Phoma medicaginis)
    [15][68] O-SPE
    Ascochyta sp. [72] C-NHE
    Ascotricha Ascotricha guamensis [56] NC-HE
    Aspergillus Aspergillus aeneus [76] SC-NHE
    Aspergillus amstelodami
    (syn. Eurotium amstelodami)
    [20][26][72] C-NHE
    Aspergillus aureolatus [15][68] O-SPE
    Aspergillus auricomus [27] O-SPE
    Aspergillus candidus [55][56][17][77] C-HE, NC-HE, C-NHE
    Aspergillus clavatus [50] C-HE
    Aspergillus creber [15][68] O-SPE
    Aspergillus echinulatus [16] C-NHE
    Aspergillus europaeus [15][68] O-SPE
    Aspergillus fischeri
    (syn. Neosartorya fischeri)
    [21] NC-HE; C-NHE
    Aspergillus flavipes [15][68] O-SPE
    Aspergillus flavus
    (syn. A. oryzae)
    [73][14][15][55][78][19][56][68][35][77][79][80][81][82][83][84][85] C-HE, NC-HE, C-NHE, O-SPE
    Aspergillus fumigatus [78][19][51][20][71][86][87][22][88] C-HE, NC-HE, C-NHE
    Aspergillus glaucus group [88] C-NHE
    Aspergillus ivoriensis [76] SC-NHE
    Aspergillus japonicus [22] C-HE
    Aspergillus melleus [76] SC-NHE
    Aspergillus multicolor [76] SC-NHE
    Aspergillus nidulans
    (syn. Emericella nidulans)
    [55][78][19][56][20][62][71][80][81][22] C-HE, NC-HE, C-NHE
    Aspergillus niger [73][14][25][15][55][78][19][56][60][61][64][67][26][68][82][84][85][87][89][90][91] All environments
    Aspergillus niger group [20] C-NHE
    Aspergillus ochraceus [51][60][76] C-HE, C-NHE, SC-NHE
    Aspergillus ostianus [15][68][76] SC-NHE, O-SPE
    Aspergillus pallidofulvus [15][68] O-SPE
    Aspergillus parasiticus [15][68] O-SPE
    Aspergillus penicilloides [92] C-HE
    Aspergillus petrakii [76] SC-NHE
    Aspergillus proliferans [55][56] NC-HE
    Aspergillus protuberus [76] SC-NHE
    Aspergillus puniceus [76] SC-NHE
    Aspergillus repens [16][53] C-NHE
    Aspergillus restrictus [72][93] C-HE, C-NHE
    Aspergillus sclerotiorum [86] C-NHE
    Aspergillus spectabilis
    (syn. Emericella spectabilis)
    [76] SC-NHE
    Aspergillus stellatus
    (syn. Emericella variecolor)
    [76] SC-NHE
    Aspergillus sydowii [55][56][17][62][63][21][79] C-HE, NC-HE, C-NHE
    Aspergillus terreus [66][78][19][56][22] C-HE, NC-HE, C-NHE
    Aspergillus unguis [86] C-NHE
    Aspergillus ustus [20][76] C-NHE, SC-NHE
    Aspergillus versicolor [14][55][19][56][17][53][57][20][60][62][26][71][76][77][79][80][81][22][91][93][43][94] C-HE, NC-HE, C-NHE, SC-NHE
    Aspergillus wentii [55][19][56] NC-HE, C-NHE
    Aspergillus sp. [18][95][25][27][45][46][96][58][40][20][61][74][75][79][85][87][91][23][97][98][99][24][100][49][101][102] C-HE, NC-HE, C-NHE, O-SPE
    Aureobasidium Aureobasidium pullulans [19][53][57][40][60][63][35] NC-HE, C-NHE
    Beauveria Beauveria bassiana [31] C-NHE
    Beauveria sp. [40][63] NC-HE, C-NHE
    Bispora Bispora sp. [28] O-SPE
    Bjerkandera Bjerkandera adusta [87] C-NHE
    Blastobotrys Blastobotrys aristatus [17] C-NHE
    Blastomyces Blastomyces sp. [93] C-HE
    Botryotrichum Botryotrichum atrogriseum [14][26][69] NC-HE, C-NHE
    Botryotricum domesticum [70] C-NHE
    Botryotrichum murorum
    (syn. Chaetomium murorum)
    [15][16][20][26][68] C-NHE, O-SPE
    Botrytis Botrytis cinerea [52][53][57][20][79] C-NHE
    Brunneochlamydosporium Brunneochlamydosporium nepalense (syn. Acremonium nepalense) [51][43] C-HE
    Burgoa Burgoa sp. [45] C-HE
    Candida Candida takamatsuzukensis [45][103] C-HE
    Candida tumulicola [45][103] C-HE
    Candida sp. [45][46][28] C-HE, NC-HE
    Capronia Capronia coronata [43] C-HE
    Cephalotrichum Cephalotrichum verrucisporum
    (syn. Doratomyces verrucisporus)
    [45][46] C-HE
    Cephalotrichum sp.
    (syn. Doratomyces sp.)
    [45][46] C-HE
    Cephalosporium Cephalosporium sp. [97][99] C-NHE
    Chaetomium Chaetomium ancistrocladum [15][68] O-SPE
    Chaetomium elatum [52] C-NHE
    Chaetomium globosum [16][27][65][19][56][51][53][20][62][26] C-HE, NC-HE, C-NHE, O-SPE
    Chaetomium piluliferum
    (syn. Botryotrichum piluliferum)
    [16][26] C-NHE
    Chaetomium sp. [12][27][96][19][17][52][57][20][28][80][81][82] NC-HE, C-NHE, O-SPE
    Chondrostereum Chondrostereum sp. [75] C-NHE
    Chrysosporium Chrysosporium pseudomerdarium [43] C-HE
    Chrysosporium sp. [59][63][21][104] C-HE, NC-HE, C-NHE, O-SPE
    Circinella Circinella muscae
    (syn. Circinella sydowii)
    [26] C-NHE
    Cladophialophora Cladophialophora tumulicola [46][48] C-HE
    Cladosporium Cladosporium cladosporioides [27][55][66][78][19][56][51][53][20][60][62][35][69][77][79][43][41][105] C-HE, NC-HE, C-NHE, O-SPE
    Cladosporium cucumerinum [20][60][62] C-HE, C-NHE
    Cladosporium herbarum [16][55][19][56][17][20][62][26][32][72][91] C-HE, NC-HE, C-NHE
    Cladosporium macrocarpum [70] NC-HE
    Cladosporium sphaerospermum [5][6][12][27][55][19][56][17][52][53][47][57][20][31][62][63][21][72][79] C-HE, NC-HE, C-NHE, O-SPE
    Cladosporium uredinicola [15][68] O-SPE
    Cladosporium xylophilum [70] C-NHE
    Cladosporium sp. [11][95][25][27][45][96][47][57][58][40][63][32][21][74][28][75][81][85][87][89][91][94][23][99][24][101][106][107][108] All environments
    Clonostachys Clonostachys rosea
    (syn. Gliocladium roseum)
    [32] C-HE
    Cochliobolus Cochliobolus geniculatus (syn. Curvulata geniculata) [56][86] NC-HE, C-NHE
    Collariella Collariella bostrychodes (syn. Chaetomium bostrychodes) [55][56] NC-HE
    Coltricia Coltricia sp. [75] C-NHE
    Coprinellus Coprinellus aokii
    (syn. Coprinus aokii)
    [76] SC-NHE
    Coprinopsis Coprinopsis atramentaria [51] C-HE
    Coprinopsis cothurnata (syn. Coprinus cothurnatus) [72] C-NHE
    Cordyceps Cordyceps farinosa
    (syn. Isaria farinosa)
    [77] C-HE
    Coriolopsis Coriolopsis sp. [75] C-NHE
    Cunninghamella Cunninghamella echinulata [12][55][56][52][26] NC-HE, C-NHE
    Cunninghamella elegans [51] C-HE
    Cunninghamella sp. [45][46] C-HE
    Curvularia Curvularia australiensis
    (syn. Drechslera australiensis)
    [55][66][78][19][56] NC-HE, C-NHE
    Curvularia hawaiiensis
    (syn. Drechslera hawaiiensis)
    [55][66][78][19][56] NC-HE, C-NHE
    Curvularia lunata [55][78][19][56][86][92] NC-HE, C-NHE
    Curvularia pallescens [66][78][19][56] NC-HE, C-NHE
    Curvularia spicifera
    (syn. Drechslera spicifera)
    [20] C-NHE
    Curvularia sp. [85] C-NHE
    Cutaneotrichosporon Cutaneotrichosporon mucoides
    (syn. Trichosporon mucoides)
    [72] C-NHE
    Cylindrocarpon Cylindrocarpon sp. [45][46] C-HE
    Cyphellophora Cyphellophora olivacea [47] C-HE
    Cyphellophora sp. [47] C-HE
    Cyphellostereum Cyphellostereum sp. [75] C-NHE
    Cystoderma Cystoderma sp. [75] C-NHE
    Devriesia Devriesia sp. [40] NC-HE
    Dichotomophilus Dichotomophilus indicus
    (syn. Chaetomium indicum)
    [26] C-NHE
    Didymella Didymella glomerata
    (syn. Phoma glomerata)
    [16][52] C-NHE
    Dipodascus Dipodascus geotrichum [26] C-NHE
    Dipodascus sp.
    (syn. Geotrichum sp.)
    [59][85] NC-HE, C-NHE
    Discostroma Discostroma corticola
    (syn. Seimatosporium lichenicola)
    [15][68] O-SPE
    Drechslera Drechslera sp. [28] O-SPE
    Emericella Emericella ruber [19] C-NHE
    Emericella sp. [60][85] C-HE, C-NHE
    Engyodontium Engyodontium sp. [40][79] C-HE, NC-HE, C-NHE
    Epicoccum Epicoccum nigrum
    (syn. Epicoccum purpurascens)
    [15][55][19][56][20][60][68][32] C-HE, NC-HE, C-NHE, O-SPE
    Epicoccum sp. [96][28][23][99] C-HE, NC-HE, C-NHE, O-SPE
    Eurotium Eurotium halophilicum [109] C-NHE
    Eurotium herbariorum [77] C-HE
    Eurotium sp. [59][28][98][100] C-HE, NC-HE, C-NHE
    Exophiala Exophiala angulospora [47][48] C-HE
    Exophiala moniliae [43] C-HE
    Exophiala sp. [45][47] C-HE
    Fomitopsis Fomitopsis vinosa [72] C-NHE
    Fusarium Fusarium chlamydosporum [62] C-HE
    Fusarium culmorum [19] C-NHE
    Fusarium equiseti [64] SC-NHE
    Fusarium fujikuroi
    (syn. F. moniliforme)
    [66][78][56][84] C-HE, NC-HE
    Fusarium oxysporum [45][55][19][56][51][20][60][32][76][83][110] C-HE, NC-HE, C-NHE, SC-NHE
    Fusarium proliferatum [87] C-NHE
    Fusarium sporotrichioides [51] C-HE
    Fusarium sp. [73][45][46][96][19][17][57][59][21][74][91][24][101][111] C-HE, NC-HE, C-NHE
    Fuscoporia Fuscoporia sp. [75] C-NHE
    Fusidium Fusidium viride [31] C-NHE
    Ganoderma Ganoderma sp. [75] C-NHE
    Gliomastix Gliomastix tumulicola
    (syn. Acremonium tumulicola)
    [45][54] C-HE
    Gliomastix sp. [32][104] C-HE
    Gloiothele Gloiothele sp. [75] C-NHE
    Helminthosporium Helminthosporium sp. [28][85][91] C-NHE, O-SPE
    Humicola Humicola fuscoatra [60] C-NHE
    Humicola udagawae [51] C-HE
    Humicola sp. [19] C-NHE
    Hyphodontia Hyphodontia alutaria [75] C-NHE
    Hyphodontia sp. [75] C-NHE
    Hyphodontiella Hyphodontiella sp. [75] C-NHE
    Hypholoma Hypholoma sp. [75] C-NHE
    Idriella Idriella sp. [32] C-HE
    Kendrickiella Kendrickiella phycomyces [45][46][112] C-HE
    Kernia Kernia geniculotricha [76] SC-NHE
    Kernia hippocrepida [76] SC-NHE
    Lactarius Lactarius sp. [75] C-NHE
    Lecanicillium Lecanicillium psalliotae [51][69] C-HE, NC-HE
    Lecanicillium sp. [77] C-HE
    Leptobacillium Leptobacillium muralicola [50] NC-HE
    Leptosphaeria Leptosphaeria sp. [28] O-SPE
    Leptosphaerulina Leptosphaerulina sp. [74] NC-HE
    Macrophomina Macrophomina phaseolina [55][19][56] NC-HE
    Malbranchea Malbranchea sp. [20] C-NHE
    Mammaria Mammaria echinobotryoides [92] C-HE
    Memnoniella Memnoniella sp. [19] C-NHE
    Metapochonia Metapochonia bulbillosa
    (syn. Verticillium bulbillosum)
    [59] C-HE, NC-HE
    Metapochonia suchlasporia
    (syn. Verticillium suchlasporium)
    [63] NC-HE, C-NHE
    Meyerozyma Meyerozyma guilliermondii [70] NC-HE
    Microascus Microascus brevicaulis
    (syn. Scopulariopsis brevicaulis)
    [16][63][77] C-HE, NC-HE, C-NHE
    Microascus chartarum
    (syn. Scopulariopsis chartarum)
    [21] NC-HE, C-NHE
    Microascus cirrosus [76] SC-NHE
    Microascus sp. [77] C-HE
    Microdochium Microdochium lycopodinum [51] C-HE
    Monilinia Monilinia sp.
    (syn. Monilia sp.)
    [91] C-NHE
    Monocillium Monocillium-like [45] C-HE
    Monodictys Monodictys castaneae
    (syn. Stemphylium macrosporoideum)
    [16] C-NHE
    Monodictys sp. [19][32] C-HE, C-NHE
    Mortierell Mortierella alpina [59] NC-HE
    Mortierella ambigua [51] C-HE
    Mortierella parvispora
    (syn. M. gracilis)
    [19] C-NHE
    Mortierella sp. [59][32] C-HE, NC-HE
    Mucor Mucor plumbeus
    (syn. M. spinosus)
    [16] C-NHE
    Mucor racemosus
    (syn. M. globosus)
    [55][56][59][70] NC-HE
    Mucor silvaticus [55][56] NC-HE
    Mucor sp. [45][20][32][74][91][49] C-HE, NC-HE, C-NHE
    Myxotrichum Myxotrichum stipitatum [20] C-NHE
    Myxotrichum sp. [20] C-NHE
    Nectria Nectria sp. [11] C-NHE
    Neocosmospora Neocosmospora solani
    (syn. Fusarium solani)
    [45][55][19][86][104][110] C-HE, NC-HE, C-NHE
    Neodevriesia Neodevriesia modesta
    (syn. Devriesia modesta)
    [41][42] O-SPE
    Neodevriesia simplex
    (syn. Devriesia simplex)
    [41][42] O-SPE
    Neodevriesia sp. [40] NC-HE
    Neosartorya Neosartorya sp. [21] NC-HE, C-NHE
    Neosetophoma Neosetophoma cerealis
    (syn. Coniothyrium cerealis)
    [79] C-NHE
    Neurospora Neurospora intermedia [86] C-NHE
    Neurospora sp. [91] C-NHE
    Nigrospora Nigrospora oryzae
    (syn. N. sphaerica)
    [55][56][91] C-HE, NC-HE, C-NHE
    Nigrospora sp. [55][91] NC-HE, C-NHE
    Oidiodendron Oidiodendron cereale [79] C-NHE
    Oidiodendron tenuissimum [60] C-NHE
    Ophiostoma Ophiostoma sp. [45] C-HE
    Paecilomyces Paecilomyces variotii [55][66][78][19][56][71] NC-HE, C-NHE
    Paecilomyces sp. [96][20][77][85][91][104] C-HE, NC-HE, C-NHE
    Parengyodontium Parengyodontium album
    (syn. Beauveria albaTritirachium album, and Engyodontium album)
    [12][16][17][52][53][47][57][31][63][69][77][101][108][33][113][114] C-HE, NC-HE, C-NHE
    Penicillium Penicillium aethiopicum [76] SC-NHE
    Penicillium albicans [49] C-NHE
    Penicillium aurantiogriseum
    (syn. P. verrucosum var. cyclopium)
    [12][53][57][62] C-HE, C-NHE
    Penicillium brevicompactum [17][52][20][77][79][101] C-HE, NC-HE, C-NHE
    Penicillium camemberti [49] C-NHE
    Penicillium canescens
    (syn. P. raciborski)
    [52][49] C-NHE
    Penicillium carneum [76] SC-NHE
    Penicillium chrysogenum
    (syn. P. notatum)
    [12][16][52][53][20][62][67][70][76][79][90][23][49][115][116] C-HE, NC-HE, C-NHE, SC-NHE
    Penicillium citreonigrum
    (syn. P. citreoviride)
    [27][32] C-HE, O-SPE
    Penicillium citrinum [19][56][52][32][86][49] C-HE, NC-HE, C-NHE
    Penicillium commune [62][64][77][49] C-HE, C-NHE, SC-NHE
    Penicillium concentricum [76] SC-NHE
    Penicillium coprobium [76] SC-NHE
    Penicillium corylophilum [58][24] C-NHE
    Penicillium daleae [24] C-NHE
    Penicillium decumbens [12][52][49] C-NHE
    Penicillium dierckxii
    (syn. P. fellutanum)
    [20] C-NHE
    Penicillium digitatum [75] C-NHE
    Penicillium dipodomyicola [76] SC-NHE
    Penicillium expansum [20][60] C-NHE
    Penicillium fuscoglaucum [70] C-NHE
    Penicillium glabrum
    (syn. P. frequentans)
    [12][17][20][60][75][49][101] NC-HE, C-NHE
    Penicillium granulatum [19] C-NHE
    Penicillium griseofulvum [20][68][35][76] C-NHE, SC-NHE
    Penicillium herquei [20] C-NHE
    Penicillium italicum [64] SC-NHE
    Penicillium javanicum
    (syn. Eupenicillium javanicum)
    [21] NC-HE, C-NHE
    Penicillium lanosum [15][68][105] NC-HE, O-SPE
    Penicillium lilacinum [16][26] C-NHE
    Penicillium meleagrinum [51][79] C-HE, C-NHE
    Penicillium miczynskii [59] SC-NHE
    Penicillium olsonii [62] C-HE
    Penicillium oxalicum [60][32] C-HE, C-NHE
    Penicillium pancosmium [51] C-HE
    Penicillium paneum [45][76][117] C-HE, SC-NHE
    Penicillium polonicum [62] C-HE
    Penicillium purpurescens [19] C-NHE
    Penicillium purpurogenum [79][49] C-NHE
    Penicillium restrictum [49] C-NHE
    Penicillium simplicissimum (syn. P. janthinellum) [32][49] C-HE, C-NHE
    Penicillium spinulosum
    (syn. P. nigricans)
    [12][52][93] C-HE, C-NHE
    Penicillium thomii [49] C-NHE
    Penicillium turbatum [64] SC-NHE
    Penicillium verrucosum [17][20] C-NHE
    Penicillium vulpinum [76] SC-NHE
    Penicillium sp. [18][11][95][25][45][46][65][55][19][57][58][40][20][59][31][32][71][74][75][80][85][87][22][89][91][94][97][98][99][24][101][106] C-HE, NC-HE, C-NHE
    Pestalotia Pestalotia sp. [65] C-NHE
    Phialophora Phialophora sp. [45][46][57][59] C-HE, C-NHE
    Phlebia Phlebia sp. [75] C-NHE
    Pholiota Pholiota sp. [75] C-NHE
    Phoma Phoma sp. [45][19] C-HE, C-NHE
    Physalacria Physalacria sp. [75] C-NHE
    Pleospora Pleospora sp. [28] O-SPE
    Postia Postia sp. [75] C-NHE
    Preussia Preussia terricola [77] C-HE
    Preussia sp. [77] C-HE
    Pseudogymnoascus Pseudogymnoascus pannorum
    (syn. Geomyces pannorum and Chrysosporium pannorum)
    [17][57][31] C-NHE
    Pseudozyma Pseudozyma prolifica [62] C-HE
    Purpureocillium Purpureocillium lilacinus
    (syn. Paecilomyces lilacinus)
    [25][51][60] C-HE, C-NHE
    Pyrenophora Pyrenophora biseptata
    (syn. Drechslera biseptata)
    [55][56] NC-HE
    Radulomyces Radulomyces sp. [75] C-NHE
    Rhinocladiella Rhinocladiella-like [45] C-HE
    Rhizoctonia Rhizoctonia solani (syn. Thanatephorus cucumeris) [15][55][56][68] NC-HE, O-SPE
    Rhizopus Rhizopus stolonifer
    (syn. R. nigricans)
    [55][19][56][64][35][83][84] C-HE, NC-HE, C-NHE
    Rhizopus sp. [96][106] NC-HE, C-NHE
    Rhodotorula Rhodotorula glutinis [60] C-NHE
    Rhodotorula mucilaginosa [75] C-NHE
    Rhodotorula sp. [11][95][75][79][89][24] C-NHE
    Russula Russula sp. [75] C-NHE
    Sagenomella Sagenomella griseoviridis [46] C-HE
    Sagenomella striatispora [46] C-HE
    Sagenomella sp. [58] NC-HE
    Sarocladium Sarocladium bacillisporum
    (syn. Acremonium bacillisporum)
    [101] NC-HE
    Sarocladium kiliense
    (syn. Acremonium kiliense)
    [16][63] NC-HE, C-NHE
    Sarocladium strictum
    (syn. Acremonium cfr. strictum)
    [45][63] C-HE, NC-HE, C-NHE
    Schizophyllum Schizophyllum commune [74] C-NHE
    Schizophyllum sp. [76] C-NHE
    Schizopora Schizopora paradoxa
    (syn. Hyphodontia paradoxa)
    [74] C-NHE
    Scolecobasidium Scolecobasidium anomalum
    (syn. Ochroconis anomala)
    [44] C-HE
    Scolecobasidium lascauxensis [43][44] C-HE
    Scolecobasidium tshawytschae
    (syn. Ochroconis tshawytschae
    [20] C-NHE
    Scopulariopsis Scopulariopsis brevicaulis [16][26] C-NHE
    Scopulariopsis fusca [17] C-NHE
    Scopulariopsis sp. [20][59][90][99] NC-HE, C-NHE
    Scytalidium Scytalidium sp. [80][81] C-NHE
    Simplicillium Simplicillium lamellicola
    (syn. Verticillium lamellicola)
    [31] C-NHE
    Skeletocutis Skeletocutis sp. [76] C-NHE
    Sordaria Sordaria humana [55][56] NC-HE
    Sphaerostilbella Sphaerostilbella sp.
    (syn. Gliocladium sp.)
    [45][49][104] C-HE, C-NHE
    Sporothrix Sporothrix sp. [58][24] NC-HE, C-NHE
    Sporotrichum Sporotrichum sp. [53][57] C-NHE
    Stachybotrys Stachybotrys chartarum
    (syn. S. atra)
    [16][19][31][67][93] NC-HE, C-NHE
    Stachybotrys cylindrosporus [16] C-NHE
    Stachybotrys echinatus
    (syn. Memnoniella echinata)
    [55][19][56] NC-HE
    Stachybotrys sp. [12][96][19] NC-HE, C-NHE
    Stagonosporopsis Stagonosporopsis lupini [70] C-NHE
    Stemphylium Stemphylium botryosum [53] C-NHE
    Stemphylium pyriforme [26] C-NHE
    Stemphylium sp. [49] C-NHE
    Stereum Stereum sp. [75] C-NHE
    Syncephalastrum Syncephalastrum sp. [85] C-NHE
    Talaromyces Talaromyces aculeatus [62] C-HE
    Talaromyces flavus [51][79] C-HE
    Talaromyces pinophilus
    (syn. Penicillium pinophilum)
    [67][101] C-HE, NC-HE
    Talaromyces rugulosus
    (syn. Penicillium rugulosum)
    [77][79][116] C-HE, C-NHE
    Talaromyces variabilis
    (syn. Penicillium variabile)
    [79] C-NHE
    Thysanorea Thysanorea papuana [43] C-HE
    Tilletiopsis Tilletiopsis sp. [79] C-NHE
    Torrubiella Torrubiella alba
    (syn. Lecanicillium aranearum)
    [101] NC-HE
    Torrubiella sp. [77][101] C-HE, NC-HE
    Torula Torula herbarum [26] C-NHE
    Torula sp. [20] C-NHE
    Tricharina Tricharina sp. [74] NC-HE
    Trichocladium Trichocladium asperum [77] C-HE
    Trichoderma Trichoderma harzianum [66][78][19][56][79] NC-HE, C-NHE
    Trichoderma sect. Longibrachiatum [45][110] C-HE
    Trichoderma virens
    (syn. Gliocladium virens)
    [32] C-HE
    Trichoderma viride [45][26][32] C-HE, C-NHE
    Trichoderma sp. [25][45][46][19][58][59][85][91][43][102][104] C-HE, NC-HE, C-NHE
    Trichothecium Trichothecium indicum
    (syn. Acremonium indicum)
    [55][19][56] NC-HE
    Trichothecium roseum [16][100] C-NHE
    Tritirachium Tritirachium sp. [76][91] C-HE, C-NHE
    Tubaria Tubaria sp. [75] C-NHE
    Tyromyces Tyromyces sp. [75] C-NHE
    Umbelopsis Umbelopsis ramanniana
    (syn. Mortierella ramanniana)
    [17][59] NC-HE, C-NHE
    Venturia Venturia carpophila
    (syn. Cladosporium carpophilum)
    [56] NC-HE
    Verticillium Verticillium alboatrum [56] NC-HE
    Verticillium sp. [45][31][63][32][104] C-HE, NC-HE, C-NHE
    Wallemia Wallemia sebi [72] C-NHE
    Wallemia sp. [100] C-NHE
    Westerdykella Westerdykella sp. [74] NC-HE
    Xylodon Xylodon nespoli [75] C-NHE
    Xylodon nothofagi [75] C-NHE
    Xylodon raduloides [75] C-NHE
    Zygosporium Zygosporium masoni [45] C-HE
      Basidiomycota (Phylum) [74] NC-HE
      Black meristematic fungi [5][41][118] NC-HE, O-SPE
      Chaetomiaceae (Family) [74] NC-HE
      Filobasidiales [74] NC-HE
      Hyaline sterile mycelia [21] NC-HE, C-NHE
      Melanized sterile mycelia [21] NC-HE, C-NHE
      Pezizomycotina (Subphylum) [74] NC-HE
      Undetermined dark pigmented fungi [14] O-SPE
      Undetermined yeasts [20] C-NHE
      Uredinales (Order) [28] O-SPE
      Ustilaginales (Order) [28] O-SPE

    3. Geographic Distribution

    Considering the geographic distribution of the data, just one site among the studied paintings comes from the Americas (the Cathedral of Havana at Cuba) [91]. The highest records were from Europe, with 70 monuments with a considerable prevalence of Italian monuments (39). A total of 26 monuments were from Asia, and the 13 from Africa were all from Egypt.

    This distribution arises from the Euro-Mediterranean area starting from the old prehistoric caves to the Etruscan and Greek-Roman traditions until the decoration of Christian churches and historical buildings [2]. In the case of the Egyptian area, the recorded taxa derived from the old tombs of the Pharaohs [67][82][83][87][22], and similarly in East Asia, where paintings are mainly found in kings’ and Emperors’ tombs [45][46][54][51].

    Researchers' results suggest that the monuments studied were often confined to restricted geographic areas. In any case, a wider geographic distribution than that recorded may be possible, as some sites/ studies could have escaped the search because of language barriers search. [link with Figure 1]

    Figure 1. Geographic distribution of the reviewed study’s 107 monuments. Nations are indicated with the international alpha-3 code: ITA: Italy, EGY: Egypt, THA: Thailand, PRT: Portugal, CHN: China, ROU: Romania, AUT: Austria, GER: Germany, JAP: Japan, IND: India, RUS: Russian Federation, ESP: Spain, SRB: Republic of Serbia, CUB: Cuba, FRA: France, KOR: Republic of Korea, SVK: Slovak Republic, CHE: Swiss, GBR: Great Britain. In the blue rectangle Cuba.

    4. Isolation and Identification Methods

    Culture-based methods favor the growth of microorganisms best fitting with the laboratory conditions used (namely, culture media, temperatures, and incubation times). In this entry, researchers found that the most frequent experimental settings were favorable to fast-growing, highly-sporulating fungi, using culture media rich in easily accessible carbon sources, alongside short incubation times and optimal growth temperatures favoring their sporulation. Otherwise, lower growth temperatures (≤20 °C), wide temperature ranges, different isolation media, and a longer incubation time could enlarge the detectable culturable fraction.

    Morphological identification was dominant since the early 2000s when molecular phylogenetic methods have been applied. This allowed a better understanding of the kingdom of Fungi, highlighting also a number of misidentifications [119]. Nowadays, the identification by barcode regions sequencing is a common practice. Even if the nuclear ITS region has been recognized as a fungal barcode, its discriminating power changes within the taxonomical groups and other/more barcode regions are often necessary for a reliable identification [120]. This is the case of the identification of species within large groups, as Fusarium, Penicillium, Aspergillus, and Cladosporium genera, where cryptic species can be detected only by sequencing multiple molecular markers [121].

    In detail, Fusarium species determination has been best made with the combined phylogeny of protein-coding genes such as elongation factor (TEF1), RNA polymerase (RPB2) and the partial β-tubulin (BT2) gene [121]. To discriminate between Penicillium andAspergillus species, β-tubulin (BT2) and calmodulin (cmdA) genes have been proposed as secondary barcodes, respectively [122][123]. While the most phylogenetic informative markers for Cladosporium were TEF1 and actin gene (actA), being ITS sequences identical for species of the same complex [124][125].

    The correct identification of strains is required in order to provide restorers more information about strains’ ecology and degradative potential. In this light, standardized identification protocols should be implemented.

    High throughput sequencing methods have recently been applied to cultural heritage purposes. These methods represent a powerful tool to define the whole fungal diversity present but not necessarily to deepen the mechanisms and the main actors of the deterioration phenomena [126]. The combination of culture-based and molecular methods should be used to better understand deterioration processes. Indeed, pure cultured microorganisms represent the key to uncovering settlers’ physiological and ecological traits and represent a resource for many in silico applications and barcoded identifications [39][127].

    5. Distribution of Taxa in the Different Environments

    Wall paintings in confined non-hypogean environments, characterized by varied thermo-hygrometric temperatures and air movement, were quite frequent. Hypogean (both confined and non-confined), where nutrients and humidity can favor fungal growth, were also represented.

    Temperature and relative humidity are among the environmental parameters most important to microbial colonization capability, and in the case of heterotrophs, a certain amount of nutrients is also needed [4][128]. The low values of temperatures, even if are not favorable for microbial growth by themselves, have a positive effect in contributing the increase in humidity, favoring water condensation on surfaces. Walls, especially in hypogean environments, generally provide these requirements [1]. Temperatures in confined environments are generally more stable than in non-confined environments, where daily and seasonal changes may occur, with ranges that affect the microbial settlement.

    Elevated moisture values and stable temperatures have been reported as ideally suited to promote microbial growth on surfaces in catacombs sites [6][101][129]. Indeed, the highest risk occurs when high humidity is coupled with high temperature values, and negative effects of rising temperatures arise only if their highest values can strongly influence the humidity values [130].

    Air movement differences between confined, semi-confined, and non-confined environments were expected to alter the number and type of fungal species recorded as well as incoming nutrients from the outside environment. A great proportion of entries in the database belonged to soil and litter dwellers such as saprotrophs, producing numerous spores that are well adapted to air-borne dispersal, and therefore, air ventilation may have a significant impact on the risk of contamination [131]. The more limited air volume movement of confined mural paintings than semi-confined ones was suggested to decrease the number of air-borne dust particles, with biofilm communities relying more on internal interactions between different microorganisms than on the external organic inputs [14].

    Among the first aerobiological studies, Savulescu and Ionita reported a greater number of isolates inside the studied monasteries than outside of them, probably due to a more favorable microclimate inside the church, which favors the development of microorganisms [26]. Pangallo and colleagues proposed for the first time a comparative analysis of the microbial component of paintings and the surrounding air to gather information on the origin of fungal contamination [80]. Aside from the importance of aerobiological studies for conserving and preventing microbial attacks on indoor painted surfaces [132], these studies have received little attention. In light of the large number of fungal species potentially harmful for restorers and visitors, constant monitoring of air spore quality and concentration, as well as the use of air filters to reduce fungal spores concentrations, would be required for site conservation [21][106][132][133].

    Significant correlations between taxa and the various environmental categories have not been recorded. Indeed, such data is not the result of the absence of a correlation between fungal growths and environmental conditions but can be considered as a direct consequence of several other influencing conditions that hide it. In fact, many are the ecological requirements that shape the ecological niches of the different species (i.e., the limiting factors), but the most conditioning factors are those that result in a quantity proximal to the upper or lower tolerance limit of an organism [134]. Then, for the various sites examined, some factors may become more relevant if their values are closer to the tolerance limit of certain organism, but this does not mean that other parameters do not play a role [135].

    Indeed, researchers' results may be influenced by a number of variables. The different sampling techniques and isolation conditions but also the presence of numerous genera that are widespread and highly sporulating and hence present in all the environmental categories must also be considered. Moreover, the absence of evident correlations could have been determined by the absence of distinct boundaries between the categories identified, with overlapping microclimatic conditions resulting in overlaps within their respective microbial communities. Finally, the heterogeneity of the data, with taxa identified at the genus or species level, may have resulted in dispersed clusters and hampered the ability to demonstrate any relationship.

    This result seems to be in line with other studies. The influence of environmental factors such as temperature, relative humidity, and the opening or closure of the temples was not evident for fungal growths on wall paintings of 12 archaeological sites in the central and western parts of Thailand [86]. Furthermore, a stronger relationship with the age of five caves in China than with the environmental conditions, such as temperature and relative humidity, was proposed to explain the observed differences in fungal communities [74]. In two distinct mural paintings, instead, the differences recorded in the microbial communities were associated to the different organic input origin (i.e., wine cellar evaporation and insect exuvia/excrements) and the microclimatic conditions. The more humid conditions favored the growth of actinomycetes, bacteria, and dark-pigmented fungi, while the other showed a biofilm, mainly dominated by xerotolerant and patchy growing sporulating fungi [14]. Differences in fungal communities were also recorded on mural paintings of two subterranean ancient Chinese tombs dating back over 1700 years, mostly due to variations in interior temperature and relative humidity and their history and drawing techniques [62].

    Other significant concerns could be related to identifying the isolated species, which was initially based solely on morphological observation. Indeed, nowadays, phylogenetic molecular approaches are routinely applied, providing a universal tool for identifying fungal species accurately.

    New methodologies such as omics techniques are now available; however, they rarely provide information at the species or genus level, and there is no guarantee that the recorded taxa are actively growing. Moreover, culture-dependent approaches may not provide a real picture of the microbial diversity actively growing at the sampling time. Therefore, a combination of culture-based and molecular approaches may be needed to gain a clear picture of the actual biodiversity present on the painted surfaces as well as to have strains to investigate their potential degradative roles.

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      Zucconi, L.; Canini, F.; Isola, D.; Caneva, G. Fungi Affecting Wall Paintings of Historical Value. Encyclopedia. Available online: https://encyclopedia.pub/entry/21382 (accessed on 07 February 2023).
      Zucconi L, Canini F, Isola D, Caneva G. Fungi Affecting Wall Paintings of Historical Value. Encyclopedia. Available at: https://encyclopedia.pub/entry/21382. Accessed February 07, 2023.
      Zucconi, Laura, Fabiana Canini, Daniela Isola, Giulia Caneva. "Fungi Affecting Wall Paintings of Historical Value," Encyclopedia, https://encyclopedia.pub/entry/21382 (accessed February 07, 2023).
      Zucconi, L., Canini, F., Isola, D., & Caneva, G. (2022, April 06). Fungi Affecting Wall Paintings of Historical Value. In Encyclopedia. https://encyclopedia.pub/entry/21382
      Zucconi, Laura, et al. ''Fungi Affecting Wall Paintings of Historical Value.'' Encyclopedia. Web. 06 April, 2022.
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