Pseudoplagiostomataceae Cheew., M.J. Wingf. & Crous, Fungal Divers. 44: 95 (2010)
MycoBank number: MB 542097; Index Fungorum number: IF 542097; Facesoffungi number: FoF 01403; 7 species.
Pathogen on leaves, forming spots. Sexual morph: Ascomata solitary, immersed, scattered, slanted to horizontal on host tissue, globose or ellipsoidal, black, coriaceous, papillate, ostiolate. Papilla short, internally covered with hyaline, periphyses. Peridium composed of few layers of brown, thick-walled cells of textura angularis. Paraphyses lacking. Asci 8-spored, unitunicate, apedicellate, cylindrical, with J-, subapical ring. Ascospores overlapping uniseriate to biseriate, hyaline, fusiform to ellipsoid, 1-septate, with terminal, elongate, hyaline appendages. Asexual morph: Coelomycetous. Conidiomata brown, acervular or pycnidial. Peridium comprising small, brown cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells enteroblastic, cylindrical to ampulliform, percurrently proliferating with periclinal thickening and collarette. Conidia unicellular, ellipsoid, hyaline to brown, subglobose to broadly- allantoid, with obtuse apex and a flat protruding scar at the base (adapted from Cheewangkoon et al. 2010).
Type genus – Pseudoplagiostoma Cheew. Cheew., M.J. Wingf. & Crous
Notes – Pseudoplagiostomataceae is distinct from other related families due to its unique morphology with ascomata slanted horizontally to the host with an aparaphysate hamathecium and ascospores with terminal, elongate, hyaline appendages. It has a distinct placement in Diaporthales based on the maximum parsimony analysis of LSU sequence data (Cheewangkoon et al. 2010). This placement was confirmed by the studies of Suwannarach et al. (2016), Du et al. (2017) and Phookamsak et al. (2019).