Tubeufiales » Tubeufiaceae

Pseudohelicomyces

Pseudohelicomyces Y.Z. Lu, J.K. Liu & K.D. Hyde, in Lu et al., Fungal Diversity 92: 248 (2018).

Index Fungorum number: IF 554886; Facesoffungi number: FoF 04745, 7 morphological species (Species Fungorum 2022), 7 species with molecular data.

Saprobic on woody substrata. 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, multiseptate, guttulate, hyaline, smooth-walled. 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 (adapted from Lu et al. 2018).

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

     Notes: Pseudohelicomyces is characterised by superficial, subglobose, clavate to obovate, coriaceous, pale brown to reddish-brown ascomata, cylindrical, pedicellate asci, and macronematous, mononematous, erect, cylindrical conidiophores. In the phylogenetic analysis of Lu et al. (2018), P. aquaticus, P. hyalosporus, P. indicus, P. paludosus and P. talbotii, which were previously accommodated in Helicomyces, clustered together with good statistical support. Pseudohelicomyces differs from Helicomyces in that the latter lacks or has reduced conidiophores formed as short, lateral branches of the repent mycelium while Pseudohelicomyces has macronematous, mononematous, erect, cylindrical conidiophores (Pirozynski 1972). Pseudohelicomyces is morphologically and phylogenetically a distinct genus in Tubeufiaceae. Molecular markers available for Pseudohelicomyces are ITS, LSU, SSU, RPB2 and TEF-1.

 

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