Distoseptisporales

Distoseptisporaceae

Distoseptisporaceae K.D. Hyde & McKenzie

Index Fungorum number: IF551850; Facesoffungi number: FoF01754; 26 species.

Saprobic on wood and in terrestrial and freshwater habitats. Sexual morph: Ascomata perithecial, dark brown to black, superficial, solitary, globose to ovoid, papillate. Ostiole periphysate. Peridium leathery, carbonaceous, dark brown, composing two layers of textura prismatica. Paraphyses numerous, hyaline, unbranched, septate, cylindrical. Asci 8-spored, unitunicate, cylindrical, with a J-, apical ring. Ascospores biseriate, hyaline to light yellowishbrown, fusiform, straight, 3-septate, lacking a mucilaginous sheath or appendages. Asexual morph: Hyphomycetous. Colonies effuse, hairy or velvety, olivaceous or black. Mycelium mostly immersed, composed of branched, septate, smooth, pale brown hyphae. Conidiophores semimacronematous to macronematous, mononematous, septate, unbranched, single or in groups, erect, straight or flexuous, smooth, olivaceous to brown, cylindrical, robust at the base, sometimes elongating percurrently. Conidiogenous cells monoblastic, integrated, determinate, terminal, cylindrical. Conidia acrogenous, solitary, olivaceous, brown or yellowish-brown to reddish-brown, euseptate or distoseptate or muriform appearing cruciately divided by septa at right angles to one another, obclavate or cylindrical, with rounded apex, indeterminately elongating percurrently, truncate at base; basal cell with cross wall and basal scar; or transversal ellipsoid to subglobose, sometimes with pores in the septa (adapted from Su et al. 2016).

Type genus: Distoseptispora K.D. Hyde, McKenzie & Maharachch.

Notes: Distoseptisporaceae was introduced in Su et al. (2016) to accommodate a single genus Distoseptispora. Asexual morphs in Distoseptisporaceae share similar morphology with species classified in Ellisembia and Sporidesmium in having holoblastic, euseptate or distoseptate conidia and monoblastic, determinate or percurrently elongating conidiogenous cells (Subramanian 1992, Shenoy et al. 2006, Yang et al. 2018). However, many of the characters used to delimit the genera do not appear phylogenetically significant (Shenoy et al. 2006, Su et al. 2016)

 

References

Hyde KD, Norphanphoun C, Maharachchikumbura SSN, Bhat DJ et al. 2020 – Refined families of Sordariomycetes. Mycosphere 11(1): 305–1059.

Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660.

Shenoy BD, Jeewon R, Wu WP, Bhat DJ, Hyde KD. 2006 – Ribosomal and RPB2 DNA sequence analyses suggest that Sporidesmium and morphologically similar genera are polyphyletic. Mycol Res 110:916–928.

Su HY, Hyde KD, Maharachchikumbura SSN, Ariyawansa HA et al. 2016 - The families Distoseptisporaceae fam. nov., Kirschsteiniotheliaceae, Sporormiaceae and Torulaceae, with new species from freshwater in Yunnan Province, China. Fungal Diversity. 80:375-409.

Subramanian CV. 1992 - A reassessment of Sporidesmium (hyphomycetes) and some related taxa. Proc Indian Natl Sci Acad B58:179–190.

Yang J, Maharachchikumbura SSN, Liu JK, Hyde KD et al. 2018b – Pseudostanjehughesia aquitropica gen. et sp. nov. and Sporidesmium sensu lato species from freshwater habitats. Mycological Progress 17, 591–616.

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Recent Genus

1
Neochlamydotubeufia
Neohelicomyces

Recent Species

Neohelicomyces submersus
Neohelicomyces hyalosporus
Neohelicomyces grandisporus