Acanthostigmina Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 118: 1499 (1909)
Index Fungorum number: IF 19; Faceoffungi number: FoF 06814, 2 morphological species (Species Fungorum 2020), 2 species with molecular data
Saprobic on rotten wood, widespread in tropical regions. Sexual morph: Ascomata superficial, solitary, scattered or clustered, globose to subglobose, dark brown, ostiolate, surrounded by sparse, dark brown to black setae; setae relatively long, tapering to an acute apex. Peridium thick, comprising several layers of textura angularis to subglobosa, inwardly comprising brown to reddish-brown, small brown cells of textura subprismatica. Hamathecium comprising numerous, filiform, septate, branched, hyaline and pale brown pseudoparaphyses, embedded in a gelatinous matrix. Asci 8- spored, bitunicate, broadly cylindric-subclavate, pedicellate, thickened at apex, without an ocular chamber. Ascospores 2– 3-seriate, elongate, cylindric-fusiform, curved, tapering towards sub-rounded ends, less than 10-septate, slightly constricted at septum, hyaline when young and pale brown at maturity, some surrounded by a mucilaginous sheath, smooth walled. Asexual morph: Unknown.
Type species: Acanthostigmina minuta (Fuckel) Clem. & Shear 1931
Notes: Acanthostigmina was introduced by von Höhnel (1909a) with A. minuta (Fuckel) Höhn. as the type species. Acanthostigmina is characterized by globose to subglobose, dark brown ascomata covered by sparse dark brown to black setae, and asci which are cylindric-subclavate with curved fusiform ascospores.