Tubeufiales » Tubeufiaceae


Pseudohelicomyces Y.Z. Lu, J.K. Liu & K.D. Hyde

Index Fungorum number: IF 554886; Facesoffungi number: FoF 04745

Etymology: “Pseudohelicomyces” referring to this genus not really “Helicomyces”.


Saprobic on decaying wood in freshwater or terrestrial habitats. Mycelium partly immersed, septate, branched hyphae. Sexual morph: Ascomata superficial, seated on a subiculum, solitary, scattered, subglobose, clavate to obovate, coriaceous, pale brown to reddish-brown, with a central ostiole, without setae. Peridium composed of cells of textura angularis, with inner cells hyaline and outer cells pale brown to brown. Hamathecium comprising numerous, filiform, septate, branched, hyaline pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical, pedicellate, apically rounded. Ascospores overlapping fasciculate, fusiform, tapering towards rounded ends, straight or slightly curved, multi-septate, guttulate, hyaline, smooth-walled (Rossman 1977; Boonmee et al. 2014). Asexual morph: Hyphomycetous, helicosporous. Conidiophores macronematous, mononematous, erect, cylindrical, branched, septate, subhyaline to brown, smooth-walled. Conidiogenous cells holoblastic, mono- to polyblastic, integrated, intercalary or terminal, cylindrical, with denticles, subhyaline to brown, smooth-walled. Conidia solitary, acropleurogenous, helicoid, rounded at tip, multi-septate, hyaline to pale brown, smooth-walled. (Description from Luo et al. 2018)


Type species: Pseudohelicomyces talbotii (Goos) Y.Z. Lu & K.D. Hyde


Notes: Pseudohelicomyces was proposed by Valenzuela and Garnica (2000) with P. albus Garnica & E. Valenz. as the type species. Lu et al. (2018) formally introduced this genus to accommodate two new species and three new combinations based on morphology and multigene phylogenetic analyses, and designed P. talbotii as the type. We follow Jayasiri et al. (2019) and conserve Pseudohelicomyces Y.Z. Lu, J.K. Liu & K.D. Hyde (Tubeufiaceae) against Pseudohelicomyces Garnica & Valenz. (Hymenogastraceae).


Three species of Pseudohelicomyces were found from freshwater habitats, viz. P. aquaticus Y.Z. Lu et al., P. hyalosporus Y.Z. Lu et al. and P. talbotii. Pseudohelicomyces hyalosporus was formerly named as Helicomyces roseus that comprises six isolates, of which five (Luo et al. 2017) are from freshwater habitats and the other (CBS 283.51) from terrestrial habitats was wrongly identified (Tsui et al. 2006). The specimen HKAS 83995 of Luo et al. (2017) was designated as the holotype of P. hyalosporus by Lu et al. (2018b). Pseudohelicomyces talbotii was found from freshwater habitats by Lu et al. (2018), with LSU, ITS, TEF and RPB2 sequence data. (Notes from Dong et al. 2020)


List of freshwater Pseudohelicomyces species

Pseudohelicomyces aquaticus Y.Z. Lu, Boonmee & K.D. Hyde, Fungal Diversity 92: 250 (2018)

Freshwater distribution: Thailand (Lu et al. 2018)

Pseudohelicomyces hyalosporus Y.Z. Lu, J.K. Liu & K.D. Hyde, Fungal Diversity 92: 251 (2018)

Freshwater distribution: China (Luo et al. 2017)

Pseudohelicomyces talbotii (Goos) Y.Z. Lu & K.D. Hyde, Fungal Diversity 92: 252 (2018)

Basionym: Helicosporium talbotii Goos, Mycologia 81(3): 368 (1989)

Freshwater distribution: Thailand (Lu et al. 2018)


Key to freshwater Pseudohelicomyces species

1. Conidiophores micronematous, conidiogenous cells monoblastic..................... P. hyalosporus

1. Conidiophores macronematous, conidiogenous cells mono- to polyblastic, sympodial.......... 2

2. Conidia coiled 2.5–3.5 times....................................................... P. aquaticus

2. Conidia coiled 1.5–2.5 times.......................................................... P.s talbotii



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