Perisporiopsidaceae E. Müll. & Arx ex R. Kirschner & T.A. Hofm., in Kirschner et al., Sydowia 62(2): 238 (2012).

= Perisporiopsidaceae E. Müll. & Arx, Beitr. Kryptfl. Schweiz 11(no. 2): 167 (1962).

MycoBank number: MB 567164; Index Fungorum number: IF 567164; Facesoffungi humber: FoF 07892; 23 species.

Parasitic, hyperparasitic or pathogenic on living leaves of various plants. Sexual morph: Ascomata or ascostromata, superficial, gregarious, solitary, uni to multi-locules, seated on a subiculum, sometimes surrounded by aerial mycelium, globose to subglobose, obovoid, bright to dark pigmented, with or without apical ostiole. Peridium relatively thick-walled, comprising hyaline and bright to dark brown cells of textura angularis. Hamathecium comprising branched, septate, anastomosed, hyaline, cellular pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, broadly ellipsoid, apically thickened, with or without ocular chamber, short pedicellate. Ascospores 2–3-seriate, ellipsoidaloblong or fusiform widest in the middle to upper part of the apical cell, with broadly rounded apex and tapering towards the ends, slightly curved, 0–4-septate, hyaline to light pigmented, sometimes pale-yellow brown, smooth- to roughwalled. Asexual morph: Hyphomycetous.

Type: Perisporiopsis Henn.

Notes: Perisporiopsidaceae includes only five genera Asteronia, Byssocallis, Chevalieropsis, Parodiellina and Perisporiopsis and is treated in Dothideomycetes as family incertae sedis (Boonmee et al. 2017; Wijayawardene et al. 2018; Index Fungorum 2020). Taxa in this family are parasitic on the surface of living leaves. Phylogenetic analyses are known from putative Perisporiopsis strains (endophytic taxa) and place the strains close to some genera in Pleosporales, but with no detail of morphology (Chaverri and Gazis 2010; Hyde et al. 2013). Furthermore, other sequence strains in GenBank are unpublished. Therefore, Perisporiopsidaceae is of uncertain taxonomic placement.