Helicotubeufia
Helicotubeufia Y.Z. Lu & J.K. Liu, in Liu et al., Mycosphere 9(3): 500 (2018).
Index Fungorum number: IF 554759; Facesoffungi number: FoF 04385, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.
Saprobic on submerged decaying wood in a freshwater stream. Sexual morph: Ascomata superficial, seated on a subiculum, solitary, scattered, subglobose to ellipsoidal-ovate, dark brown to black, with a central ostiolate. Peridium composed of cells of textura angularis, with inner cells pale brown and outer cells brown. Hamathecium comprising numerous, filiform, septate, branched, hyaline pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical, short or long-pedicellate, apically rounded. Ascospores fusiform, tapering towards rounded ends, slightly curved, guttulate, 5–8- septate, not constricted at septa, hyaline, smooth-walled. Asexual morph: Hyphomycetous, helicosporous. Conidiophores hyaline, macronematous, partially erect, partially immersed, cylindrical, septate, smooth-walled. Conidiogenous cells holoblastic, polyblastic, sympodial, integrated, terminal or intercalary, cylindrical, with a truncate apex, hyaline, smooth-walled. Conidia acropleurogenous, helicoid, coiled 2½–3½ times when tightly coiled, becoming loosely coiled in the water, basal cell rounded at tip, multi-septate, not constricted at septa, hyaline, smooth-walled (adapted from Liu et al. 2018).
Type species: Helicotubeufia guangxiensis Y.Z. Lu & J.K. Liu
Notes: Helicotubeufia is characterised by subglobose to ellipsoidal-ovate, dark brown to black ascomata, cylindrical asci with hyaline fusiform, slightly curved ascospores, and hyphomycetous helicosporous asexual morphs. Helicotubeufia is morphologically and phylogenetically a distinct and well-defined genus in Tubeufiaceae. Molecular markers available for Helicotubeufia are ITS, LSU, RPB2 and TEF-1.
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