Pleosporales » Amniculicolaceae

Vargamyces

Vargamyces Tóth

Index Fungorum number: IF 10375

Saprobic on submerged wood or leaves. Sexual morph: Undetermined. Asexual morph: Mycelium mostly immersed, composed of septate, hyaline to pale brown, smooth hyphae. Conidiophores micronematous to semimacronematous, solitary, erect, straight to flexuous, cylindrical, subhyaline to pale brown, with percurrent proliferations. Conidiogenous cells integrated, terminal, cylindrical to cupuliforme, hyaline to pale brown. Conidia solitary, fusiform, truncate at the base, apically rounded, paler toward the ends, multi-septate, smooth-walled. Microconidia blastic growing on undifferentiated hyphae, solitary, terminal, lateral or intercalary, globose to obovoid, unicellular, hyaline, smooth (Hernández-Restrepo et al. 2017).

Notes: The monotypic genus Vargamyces was introduced by Tóth (1979) to accommodate V. aquaticus which was collected from submerged leaves and wood (Dudka 1966; Hyde and Goh 1999). Vargamyces aquaticus was transferred to Xylomyces based on detachable, fusiform, dematiaceous and multiseptate chlamydospores (Hyde and Goh 1999). However, Hernández-Restrepo et al. (2017) showed that V. aquaticus clustered in Amniculicolaceae, which is phylogenetically distant from the type species of Xylomyces, X. chlamydosporus. Therefore, Vargamyces is distinct and the only asexual genus in Amniculicolaceae, as listed in Wijayawardene et al. (2018, 2020). The lectotype (Dudka (1966)) and epitype (CBS H-22992, culture ex-epitype CBS 636.91) were also designated by Hernández-Restrepo et al. (2017).

Type species: Vargamyces aquaticus (Dudka) Tóth, Acta Mus. Silesiae, Ser. A 25(3-4): 403 (1980) [1979]

References:

Dong, W., Wang, B., Hyde, K.D., McKenzie, E.H.C., Bhat, D.J et al. (2020) Freshwater Dothideomycetes. Fungal Diversity

Dudka IA (1966) New and rare species of fungi imperfecti from the basins of the southern part of Kiev Polessye. Ukr Bot J 23:91-95

Hernández-Restrepo M, Gené J, Castañeda-Ruiz RF, Mena-Portales J et al. (2017) Phylogeny of saprobic microfungi from Southern Europe. Studies in Mycology 86:53-97

Hyde KD, Goh TK (1999a) Fungi on submerged wood from the River Coln, England. Mycol Res 103:1561-1574

Tóth S (1979) Vargamyces, a new genus of hyphomycetes on sub- merged plant debris. Acta Bot 25:403-410

Wijayawardene NN, Hyde KD, Al-Ani LKT, Tedersoo L et al. (2020) Outline of Fungi and fungus-like taxa. Mycosphere 11:1060-1456

Wijayawardene NN, Hyde KD, Lumbsch HT, Liu JK et al. (2018) Outline of Ascomycota: 2017. Fungal Diversity 88:167-263

 

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