This article is the 13th contribution in the Fungal Diversity Notes series, wherein 125 taxa from four phyla, ten classes, 31 orders, 69 families, 92 genera and three genera incertae sedis are treated, demonstrating worldwide and geographic distribution. Fungal taxa described and illustrated in the present study include three new genera, 69 new species, one new combination, one reference specimen and 51 new records on new hosts and new geographical distributions. Three new genera, Cylindrotorula (Torulaceae), Scolecoleotia (Leotiales genus incertae sedis) and Xenovaginatispora (Lindomycetaceae) are introduced based on distinct phylogenetic lineages and unique morphologies. Newly described species are Aspergillus lannaensis, Cercophora dulciaquae, Cladophialophora aquatica, Coprinellus punjabensis, Cortinarius alutarius, C. mammillatus, C. quercoflocculosus, Coryneum fagi, Cruentomycena uttarakhandina, Cryptocoryneum rosae, Cyathus uniperidiolus, Cylindrotorula indica, Diaporthe chamaeropicola, Didymella azollae, Diplodia alanphillipsii, Dothiora coronicola, Efibula rodriguezarmasiae, Erysiphe salicicola, Fusarium queenslandicum, Geastrum gorgonicum, G. hansagiense, Helicosporium sexualis, Helminthosporium chiangraiensis, Hongkongmyces kokensis, Hydrophilomyces hydraenae, Hygrocybe boertmannii, Hyphoderma australosetigerum, Hyphodontia yunnanensis, Khaleijomyces umikazeana, Laboulbenia divisa, Laboulbenia triarthronis, Laccaria populina, Lactarius pallidozonarius, Lepidosphaeria strobelii, Longipedicellata megafusiformis, Lophiotrema lincangensis, Marasmius benghalensis, M. jinfoshanensis, M. subtropicus, Mariannaea camelliae, Melanographium smilaxii, Microbotryum polycnemoides, Mimeomyces digitatus, Minutisphaera thailandensis, Mortierella solitaria, Mucor harpali, Nigrograna jinghongensis, Odontia huanrenensis, O. parvispina, Paraconiothyrium ajrekarii, Parafuscosporella niloticus, Phaeocytostroma yomensis, Phaeoisaria synnematicus, Phanerochaete hainanensis, Pleopunctum thailandicum, Pleurotheciella dimorphospora, Pseudochaetosphaeronema chiangraiense, Pseudodactylaria albicolonia, Rhexoacrodictys nigrospora, Russula paravioleipes, Scolecoleotia eriocamporesi, Seriascoma honghense, Synandromyces makranczyi, Thyridaria aureobrunnea, Torula lancangjiangensis, Tubeufia longihelicospora, Wicklowia fusiformispora, Xenovaginatispora phichaiensis and Xylaria apiospora. One new combination, Pseudobactrodesmium stilboideus is proposed. A reference specimen of Comoclathris permunda is designated. New host or distribution records are provided for Acrocalymma fici, Aliquandostipite khaoyaiensis, Camarosporidiella laburni, Canalisporium caribense, Chaetoscutula juniperi, Chlorophyllum demangei, C. globosum, C. hortense, Cladophialophora abundans, Dendryphion hydei, Diaporthe foeniculina, D. pseudophoenicicola, D. pyracanthae, Dictyosporium pandanicola, Dyfrolomyces distoseptatus, Ernakulamia tanakae, Eutypa flavovirens, E. lata, Favolus septatus, Fusarium atrovinosum, F. clavum, Helicosporium luteosporum, Hermatomyces nabanheensis, Hermatomyces sphaericoides, Longipedicellata aquatica, Lophiostoma caudata, L. clematidis-vitalbae, Lophiotrema hydei, L. neoarundinaria, Marasmiellus palmivorus, Megacapitula villosa, Micropsalliota globocystis, M. gracilis, Montagnula thailandica, Neohelicosporium irregulare, N. parisporum, Paradictyoarthrinium diffractum, Phaeoisaria aquatica, Poaceascoma taiwanense, Saproamanita manicata, Spegazzinia camelliae, Submersispora variabilis, Thyronectria caudata, T. mackenziei, Tubeufia chiangmaiensis, T. roseohelicospora, Vaginatispora nypae, Wicklowia submersa, Xanthagaricus necopinatus and Xylaria haemorrhoidalis. The data presented herein are based on morphological examination of fresh specimens, coupled with analysis of phylogenetic sequence data to better integrate taxa into appropriate taxonomic ranks and infer their evolutionary relationships.

The recent realistic estimate of fungal numbers which used various algorithms was between 2.2 and 3.8 million. There are nearly 100,000 accepted species of Fungi and fungus-like taxa, which is between 2.6 and 4.5% of the estimated species. Several forums such as Botanica Marina series, Fungal Diversity notes, Fungal Biodiversity Profiles, Fungal Systematics and Evolution—New and Interesting Fungi, Mycosphere notes and Fungal Planet have enhanced the introduction of new taxa and nearly 2000 species have been introduced in these publications in the last decade. The need to define a fungal species more accurately has been recognized, but there is much research needed before this can be better clarified. We address the evidence that is needed to estimate the numbers of fungi and address the various advances that have been made towards its understanding. Some genera are barely known, whereas some plant pathogens comprise numerous species complexes and numbers are steadily increasing. In this paper, we examine ten genera as case studies to establish trends in fungal description and introduce new species in each genus. The genera are the ascomycetes Colletotrichum and Pestalotiopsis (with many species or complexes), Atrocalyx, Dothiora, Lignosphaeria, Okeanomyces, Rhamphoriopsis, Thozetella, Thyrostroma (relatively poorly studied genera) and the basidiomycete genus Lepiota. We provide examples where knowledge is incomplete or lacking and suggest areas needing further research. These include (1) the need to establish what is a species, (2) the need to establish how host-specific fungi are, not in highly disturbed urban areas, but in pristine or relatively undisturbed forests, and (3) the need to establish if species in different continents, islands, countries or regions are different, or if the same fungi occur worldwide? Finally, we conclude whether we are anywhere near to flattening the curve in new species description.

A comprehensive account of fungal classification from freshwater habitats is outlined and discussed in the present review based on literature of biodiversity studies and recent morpho-phylogenetic analyses. A total of 3,870 freshwater fungal species are listed with additional details on the isolation source, habitat, geographical distribution, and molecular data. The Ascomycota (2,968 species, 1,018 genera) dominated the freshwater fungal taxa wherein Sordariomycetes (823 species, 298 genera) had the largest number, followed by Dothideomycetes (677 species, 229 genera), Eurotiomycetes (276 species, 49 genera), and Leotiomycetes (260 species, 83 genera). Other phyla included in the updated classification of freshwater fungi are: Chytridiomycota (333 species, 97 genera), Rozellomycota (221 species, 105 genera), Basidiomycota (218 species, 100 genera), Blastocladiomycota (47 species, 10 genera), Monoblepharomycota (29 species, 6 genera), Mucoromycota (19 species, 10 genera), Aphelidiomycota (15 species, 3 genera), Entomophthoromycota (6 species, 4 genera), Mortierellomycota (5 species, 3 genera), Olpidiomycota (4 species, 1 genus), Zoopagomycota (3 species, 2 genera), and Sanchytriomycota (2 species, 2 genera). The freshwater fungi belong to 1,361 genera, 386 families and 145 orders. The Pleosporales and Laboulbeniaceae are the largest freshwater fungal order and family comprised of 391 and 185 species, respectively. The most speciose genera are Chitonomyces (87, Laboulbeniomycetes), Verrucaria (50, Eurotiomycetes), Rhizophydium (52, Rhizophydiomycetes), Penicillium (47, Eurotiomycetes), and Candida (42, Saccharomycetes).

This is a multidimensional review of mangrove fungi occurring as saprobes, pathogens and endophytes of a wide range of host substrates and those isolated from the water columns and sediments in mangroves. Eight-hundred and fifty taxa including 658 that are supported by both morphology and molecular data and 192 with only morphological data are listed. These constitute Ascomycota, the dominant group with 773 species, and 58 Basidiomycota, one Blastocladiomycota, five Chytridiomycota, and 13 Mucoromycota. This study also includes data on mangrove yeasts 103 Ascomycota, 39 Basidiomycota and 193 taxa isolated from sediments. Endophytes isolated from submerged parts of mangrove plants total 38. The most specious orders of mangrove fungi are Pleosporales 133, Saccharomycetales 102, Microascales 101, Eurotiales 87, Hypocreales 60 and Xylariales 54. Speciose genera include Candida 39, Aspergillus 53, Penicillium 17 and Corollospora 16. The highest number of mangrove fungi have been recorded from the Pacific Ocean 553, which is the largest ocean, followed by Indian 408 and Atlantic Oceans 259. Geographical distribution of mangrove fungi varied from ocean to ocean with only 109 taxa common to the Atlantic, Indian and Pacific Oceans. Of the various countries reported for mangrove fungi, India accommodates the highest number (339) followed by Thailand 303, Malaysia 171, Florida Everglades, USA 134 and Brunei 134. A total of 60 different mangrove plants and their associates have been surveyed for mangrove fungi. These results are discussed and compared with previous studies.

This article revises the documented diversity of known marine fungi from nine phyla, 33 classes, 107 orders, 273 families, 767 genera and 1898 species reported worldwide. A member of the Aphelidiomycota, Pseudaphelidium drebesii, is reported for the first time from the marine environment, on a diatom. Likewise, the phylum Mortierellomycota is listed following taxonomic changes, as are six subclasses: Chaetothyriomycetidae, Savoryellomycetidae, Sclerococcomycetidae, Agaricostilbomycetidae, Auriculariomycetidae and Aphelidiomycotina. Thirty-three orders and 105 family names with marine species are added to the checklist, along with 641 species in 228 genera, bringing the total to 1898. New additions of species added to the list of marine fungi are highlighted. Four new combinations are proposed: Stigmatodiscus mangrovei, Diaporthe krabiensis and Diaporthe xylocarpi, while the hyphomycete Humicola alopallonella is referred to the genus Halosphaeriopsis, as Halosphaeriopsis alopallonella.

This article is the 17th in the Fungal Diversity Notes series which allows the researchers to publish fungal collections with updated reports of fungus-host and fungus-geography. Herein we report 97 taxa with four new genera distributed in three phyla (Ascomycota, Glomeromycota and Mucoromycota), 11 classes, 38 orders and 62 families collected from various regions worldwide. This collection is further classified into taxa from 69 genera with four novel genera namely Jinshana, Lithophyllospora, Parapolyplosphaeria and Stegonsporiicola. Furthermore, 71 new species, 21 new records, one new combination and four novel phylogenetic placements are provided. The new species comprise Acrocalymma estuarinum, Aggregatorygma isidiatum, Alleppeysporonites elsikii, Amphibambusa aquatica, Apiospora hongheensis, Arthrobotrys tachengensis, Calonectria potisiana, Collariella hongheensis, Colletotrichum squamosae, Corynespora chengduensis, Diaporthe beijingensis, Dicellaesporites plicatus, Dicellaesporites verrucatus, Dictyoarthrinium endophyticum, Distoseptispora chiangraiensis, Dothiora eucalypti, Epicoccum indicum, Exesisporites chandrae, Fitzroyomyces pseudopandanicola, Fomitiporia exigua, Fomitiporia rondonii, Fulvifomes subthailandicus, Gigaspora siqueirae, Gymnopus ailaoensis, Hyalorbilia yunnanensis, Hygrocybe minimiholatra, H. mitsinjoensis, H. parviholatra, H. solis, H. vintsy, Helicogermslita kunmingensis, Jinshana tangtangiae, Kirschsteiniothelia dujuanhuensis, Lamproderma subcristatum, Leucoagaricus madagascarensis, Leucocoprinus mantadiaensis, Lithophyllospora australis, Marasmius qujingensis, Melomastia aquilariae, Monoporisporites jansoniusii, M. pattersonii, Monoporisporites valdiyae, Mucispora maesotensis, Mucor soli, Muyocopron yunnanensis, Nigrospora tomentosae, Ocellularia psorirregularis, Ophiocordyceps duyunensis, Oxneriaria nigrodisca, Oxydothis aquatica, O. filiforme, Phacidiella xishuangbannaensis, Phlebiopsis subgriseofuscescens, Pleurothecium takense, Pleurotus tuber-regium, Pseudochaetosphaeronema puerensis, Pseudodactylaria guttulate, Racheliella chinensis, Rhexoacrodictys fangensis, Roussoella neoaquatica, Rubroboletus pruinosus, Sanghuangporus subzonatus, Scytalidium assmuthi, Shrungabeeja kudremukhensis, Spirographa skorinae, Stanjehughesia bambusicola, Stegonsporiicola aurantiaca, Umbelopsis hingganensis, Vararia tenuata, Verruconis pakchongensis, Wongia bandungensis, and Zygosporium cymodoceae. The new combination is Parapolyplosphaeria thailandica (≡ Polyplosphaeria thailandica). The 21 new hosts, geographical and habitat records comprise Acrocalymma fici, Apiculospora spartii, Aspergillus subramanianii, Camposporium ramosum, Clonostachys rogersoniana, Colletotrichum brevisporum, C. plurivorum, Collybiopsis gibbosa, Dictyosporium tratense, Distoseptispora adscendens, Exosporium livistonae, Ganoderma gibbosum, Graphis mikuraensis, Gymnosporangium paraphysatum, Lasiodiplodia thailandica, Moesziomyces bullatus, Penicillium cremeogriseum, P. echinulonalgiovense, P. javanicum, P. lanosocoeruleum, P. polonicum, and Pleurotus tuber-regium. Graphis chlorotica, G. panhalensis and G. parilis are given as novel phylogenetic placements. In addition, we provide the morphology of Tarzetta tibetensis which was missing in the previous Fungal Diversity Notes 1611–1716. Identification of characterization of all these taxa are supported by morphological and multigene phylogenetic analyses.