Pseudosydowia Thambug. & K.D. Hyde, Fungal Diversity 68: 140 (2014).
Index Fungorum number: IF 550733; MycoBank number: MB 550733; Facesoffungi number: FoF 00105; 2 morphological species (Species Fungorum 2020), 2 species with molecular data.
Sexual morph: Ascomata amphigenous, black, subepidermal, becoming erumpent, separate or aggregated in clusters, globose with apical ostiole; wall consisting of several layers of dark brown textura angularis. Asci 8-spored, bitunicate, fasciculate, broadly ellipsoid to clavate, straight to slightly curved, subsessile with a well-developed ocular chamber. Ascospores overlapping, bi- to multiseriate, hyaline, (1–)3(–4)-septate at maturity, constricted at the median septum, aguttulate, thin-walled, straight to slightly curved, obovoid to ellipsoid with obtuse ends, tapering towards both ends, but more prominently towards the lower end. Asexual morph: Coniothyrium-like synanamorph: Conidiomata pycnidial to acervular, dark brown, semi-thick-walled. Conidiophores reduced to conidiogenous cells, annellidic, integrated, indeterminate, formed from the inner cells of the conidiomatal wall, hyaline to pale brown, smooth, slightly thick-walled, short-cylindrical to narrowly ampulliform, slightly tapered toward the apex. Conidia aseptate, medium brown to olivaceous-brown, ellipsoid to ovoid, not guttulate, thin-walled.
Type species – Pseudosydowia eucalypti (Verwoerd & du Plessis) Thambug. & K.D. Hyde, in Thambugala et al., Fungal Diversity 68: 140 (2014).
Notes – The monotypic genus Pseudosydowia was described by Thambugala et al. (2014a) in Saccotheciaceae. The type species of this genus (Pseudosydowia eucalypti) was originally described by Verwoerd & du Plessis (1931) as Sphaerulina eucalypti and later it was transferred to Sydowia based on its Sclerophoma and Hormonema asexual morphs and the thick-walled ascostromata (Crous et al. 2003b). However, more fresh collections and culture studies of Pseudosydowia need to be made in order to clarify the relationship with other genera in the family. The genus is characterized by amphigenous, subepidermal ascostromata, 2- to multi-seriate, hyaline ascospores, pycnidial to avervular, amphigenous conidiomata and aseptate, brown conidia.