Nematotheciaceae Boonmee & K.D. Hyde, in Boonmee et al., Mycosphere 8(10): 1728 (2017).

MycoBank number: MB 553836; Index Fungorum number: IF 553836; Facesoffungi numbers: FoF 03700, 12 species.

Parasitic on lower surface of living leaves. Mycelium covered ascomata, with or without hyphopodia-like structures. Sexual morph: Ascomata superficial, with a subiculum, gregarious or solitary, globose to subglobose, dark brown, with apical ostiole, covered by dark brown mycelium. Peridium comprises multilayers of dark brown cells of textura angularis. Hamathecium comprising numerous, cylindrical, filiform, branched, septate, cellular pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical-subclavate, sessile. Ascospores fasciculate, multi-seriate, elongate fusiform, curved or flexuous, tapering towards the acute ends, brown, multi-septate. Asexual morph: Undetermined (adapted from Boonmee et al. 2017).

Type: Nematothecium Syd. & P. Syd.

Notes: Nematotheciaceae was established based on morphology by Boonmee et al. (2017) to accommodate three parasitic genera Nematothecium (type genus), Nematostigma and Ophioparodia. Boonmee et al. (2017) mentioned that Nematotheciaceae is similar to Tubeufiaceae in the features of ascomata, asci and ascospores, however, it differs from Tubeufiaceae by being parasitic and occurring on living leaves. Sequence data is not available for this family.