Pseudothyridariella
Pseudothyridariella Mapook & K.D. Hyde, in Mapook et al., Fungal Diversity 101: 98 (2020).
Index Fungorum number: IF 557357; Facesoffungi number: FoF 07826, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.
Saprobic on dead stems or decaying wood. Sexual morph: Ascomata immersed to erumpent, solitary or scattered, appearing as dark spots, coriaceous, globose or subglobose to obpyriform, yellowish brown to brown. Ostiolar neck protruding. Peridium several layers, light brown or brown to yellowish brown cells of textura angularis. Hamathecium composed of cylindrical to fliform, septate, branching pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindric-clavate, straight or slightly curved, pedicellate at base, with an ocular chamber at apically rounded apex. Ascospores overlapping, 1–2 seriate, hyaline to greyish brown, uniseptate when immature, hyaline to brown or olivaceous-brown to dark brown at maturity, ellipsoid to broadly fusiform, muriform, with (3–)5–8-transverse septa, and 1 vertical septum, slightly constricted at the central septum, straight or slightly curved, surrounded by hyaline gelatinous sheath, with central septum observed clearly when mounted in Indian ink. Asexual morph: see Li et al. (2023b) (adapted from Mapook et al. 2020).
Type species: Pseudothyridariella chromolaenae Mapook & K.D. Hyde
Notes: Pseudothyridariella is characterised by immersed to erumpent, globose or subglobose to obpyriform, yellowish brown to brown ascomata, cylindric-clavate, straight or slightly curved asci and hyaline to greyish brown, uniseptate ascospores (Mapook et al. 2020). Pseudothyridariella is similar to Thyridariella in having ellipsoid to broadly fusiform, muriform ascospores surrounded by a hyaline gelatinous sheath (Devadatha et al. 2018, Mapook et al. 2020). However, in Pseudothyridariella the sheath is constricted at the central septum while in Thyridariella it is not constricted at the central septum (Devadatha et al. 2018, Mapook et al. 2020). Pseudothyridariella is a distinct and well-defined genus with high statistical support in Thyridariaceae. Molecular markers available for Pseudothyridariella are ITS, LSU, SSU, RPB2 and TEF-1.
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