Neotrimmatostroma Quaedvl. & Crous, in Quaedvlieg, Binder, Groenewald, Summerell, Carnegie, Burgess & Crous, Persoonia 33: 27 (2014)
Index Fungorum number: IF 807813; Facesoffungi number: FoF 04960, 3 morphological species (Species Fungorum 2021), 3 species with molecular data.
Foliicolous or pathogenic on leaf. Sexual morph: Ascomata pseudothecial, separate, dark brown, sub epidermal, becoming erumpent, globose. Ostiole apical, central, frequently opening by irregular rupture. Peridium comprising 2–3 layers of dark brown, thick-walled cells of textura angularis. Asci fasciculate, bitunicate, aparaphysate (remains of the hamathecium observed in some ascomata), 8-spored, obovoid to broadly ellipsoidal, straight to slightly incurved. Ascospores tri- to multiseriate, fusoid-ellipsoidal with obtuse ends, hyaline, smooth, pale brown and verruculose in old asci, becoming 3-septate, not constricted at median septum, thick-walled, guttulate, widest in the middle of the apical cell, with persistent mucous sheath. Asexual morph: Conidiomata sporodochial, at times concentrically arranged, dark brown to black, dry, powdery, confined to the lesions. Conidiophores branched at base, pale brown, smooth, loosely aggregated, pale brown. Conidiogenous cells terminal, cylindrical to doliiform, holothallic, pale brown. Conidia formed in basipetal chains, smooth, medium brown, 4-celled, consisting of two basal cells with truncate lateral sides (adhesion scars present when catenulate), each giving rise to a secondary globose apical cell, that may extend and develop two additional septa; septa dark brown and thick-walled between the primary and secondary cells (Adapted from Crous et al. 2019).
Type species: Neotrimmatostroma excentricum (B. Sutton & Ganap.) Quaedvl. & Crous
Notes: Neotrimmatostroma was introduced by Quaedvlieg and Crous in Quadvlieg et al. (2014) with N. excentricum as type species. Neotrimmatostroma is unique in having ascospores becoming brown and up to 3-septate in older asci, have a determined mucoid sheath, and often have remnants of the hamathecium in the ascomatal cavity. The asexual morph differs from Trimmatostroma in having conidiogenous cells that give rise to 4-celled conidia with two basal cells that have truncate lateral sides and two globose apical cells, separated by dark brown, thick-walled septa.