Acanthotubeufia Y.Z. Lu & K.D. Hyde, in Lu et al., Fungal Diversity 92: 146 (2018).
Saprobic on decaying wood. Sexual morph: Ascomata superficial, scattered or gregarious, globose to subglobose, shiny, black when dry, densely setose. Setae one-celled or rarely one-septate, thick-walled, brown to dark brown, straight to slightly curved, with acute tip. Peridium two-layered in longitudinal section, inner layer composed of 3–5 rows of light brown, thin-walled, flattened to angular cells, outer layer composed of 1–2 rows of dark brown, angular to elongated cells which sometimes produce setae. Hamathecium comprising numerous, filiform, septate, branched pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical to cylindrical-clavate, broadly rounded and thickened at the apex, short- pedicellate, hyaline, smooth-walled. Ascospores fasciculate, filiform, straight or curved or sometimes sigmoid, tapering and narrowly rounded at both ends, symmetrical at ends, 12–16-septate, not constricted at septa, hyaline, smooth-walled (Promputtha and Miller 2010; Lu et al. 2018). Asexual morph: Unknown (adapted from Lu et al. 2018).
Type species: Acanthotubeufia filiformis (Promp. & A.N. Mill.) Y.Z. Lu & K.D. Hyde
Notes: Acanthotubeufia is characterised by superficial, globose to subglobose ascomata, cylindrical to cylindrical-clavate asci and filiform, straight or curved 12–16-septate hyaline ascospores. Acanthotubeufia resembles Neoacanthostigma and Acanthostigma in having one-celled or sometimes one-septate setae covering the globose to subglobose ascomata, but can be differentiated by longer and narrower symmetrical filiform ascospores. Acanthotubeufia is morphologically and phylogenetically a distinct genus in Tubeufiaceae. Molecular markers available for Acanthotubeufia are ITS and LSU.