Pseudoperisporiaceae Toro, in Seaver & Palacios Chardon, Scient. Surv. P. Rico 8(1): 40 (1926).

MycoBank number: MB 81227; Index Fungorum number: IF 81227; Facesoffungi number: FoF 00122; 48 species.

Parasitic, biotrophic or saprobic on leaves, or other fungi, primarily in tropical regions. Sexual morph: Ascomata superficial, solitary to gregarious, scattered, globose to subglobose, collapsed when dry, surrounded by brown mycelium at the base, ostiole central and surrounded by brown, septate setae, tapering to subacute apex. Peridium composed of cells of textura angularis, brown to red brown, thin-walled, sometimes collapsed when dry. Hamathecium comprising cylindrical, filiform, hyaline, branched, septate, cellular pseudoparaphyses, in a gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, oblong-clavate, slightly curved, thickened at the apex, sessile, or with knob-like pedicel, with small ocular chamber. Ascospores 2-seriate, fusoid-ellipsoid, rounded and subacute ends, hyaline, becoming brownish at maturity, 1-septate, slightly constricted at the septum, wall minutely verrucose. Asexual morph: Coelomycetous.

Type: Lasiostemma Theiss., Syd. & P. Syd.

Notes: Pseudoperisporiaceae comprises only four genera Bryomyces, Eudimeriolum, Lasiostemma and Nematostoma and is treated in Dothideomycetes as family incertae sedis (Boonmee et al. 2017; Wijayawardene et al. 2018). Taxa in this family are reported as parasitic or saprobic on leaves (Hyde et al. 2013, 2017; Boonmee et al. 2017). The family lacks molecular data to establish phylogenetic placement, especially as the type species is yet to be sequenced.