Acanthohelicospora Boonmee & K.D. Hyde, in Boonmee et al., Fungal Diversity 68(1): 251 (2014).
Saprobic on dead wood. Sexual morph: Ascomata superficial, solitary, scattered, globose to subglobose, black, ostiolate, surrounded with black setae that taper to an acute apex. Peridium composed of several layers, with outer layer of cells compressed and black, with inner layer comprising brown cells of textura angularis. Hamathecium comprising numerous, filiform, septate, branched, hyaline pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical, pedicellate, with thick, rounded apex, lacking an ocular chamber. Ascospores overlapping fasciculate, long fusiform-cylindrical, straight to slightly curved, more than 7-septate, not constricted at any septum, hyaline, smooth-walled. Asexual morph: hyphomycetous, helicosporous, helicomyces-like. Conidiophores mononematous, erect, pale brown to brown, smooth-walled. Conidiogenous cells holoblastic, terminal or intercalary, dentate, smooth, with a thickened and truncate conidiogenous loci. Conidia helicosporous, with wide filaments, coiled, curved, tapering to narrowly rounded ends, multiseptate, not constricted at septum, hyaline, guttulate, smooth-walled (adapted from Boonmee et al. 2014).
Type species: Acanthohelicospora pinicola Boonmee & K.D. Hyde
Notes: The asexual morph of Acanthohelicospora is similar to Helicosporium in conidiophore, conidiogenous cell and conidial morphology (Lu et al. 2017a; 2018b). Acanthohelicospora is unique in having superficial ascomata encased by setae which are narrowed to an acute apex and fusiform ascospores, which taper towards rounded the ends (Boonmee et al. 2014b; Lu et al. 2018b). Molecular markers available for Acanthohelicospora are ITS, LSU, RPB2 and TEF-1.