Neochaetothyrina Crous, in Crous et al., Persoonia 46: 391 (2021).
Leaf spots absent, saprobic. Sexual morph: Ascomata hypophyllous, superficial on leaf tissue, brown, developing beneath a brown mycelial layer, globose, cupulate when dry, surface of brown textura epidermoidea, wall of 2–3 layers of brown textura angularis; outer wall of ascomata forming brown, radiating superficial hyphae, branched, septate, anastomosing, with mucoid sheath, constricted at septa; hyphopodia not seen. Setae arising from outer wall of ascoma, dark brown, verruculose to warty, thick-walled, flexuous, multi-septate, tapering to subobtuse apex, at times also arising from superficial mycelium surrounding ascoma, with basal T-cell, slightly swollen. Pseudoparaphyses hyaline, smooth, cellular, constricted at septa, anastomosing. Asci arranged in basal layer, obovoid to broadly ellipsoid, bitunicate, 8-spored, with apical chamber. Ascospores multiseriate, hyaline, smooth, thick-walled, guttulate, granular, fusoid-ellipsoid, straight or curved, apex subobtuse, tapering to obtuse base, constricted at median septum, widest above septum, encased in mucoid sheath. Asexual morph: Unknown (adapted from Crous et al. 2021).
Type species: Neochaetothyrina syzygii Crous
Notes: Neochaetothyrina is characterised by hypophyllous, globose ascomata, obovoid to broadly ellipsoid, bitunicate, 8-spored asci and multiseriate, hyaline, smooth, thick-walled, guttulate ascospores. Neochaetothyrina resembles Chaetothyrina but differs in lacking superficial hyphae and setae (Hongsanan et al. 2017). Neochaetothyrina is morphologically and phylogenetically a distinct genus in Phaeothecoidiellaceae. Molecular markers available for Neochaetothyrina include ITS, LSU and RPB2.