Angustospora
Angustospora Abdel-Aziz, Fungal Divers. 78: 54 (2016).
Index Fungorum number: IF 551714; Facesoffungi number: FoF 01632, 1 morphological species (Species Fungorum 2021), 1 species with molecular data.
Saprobic on submerged wood. Sexual morph: Ascomata solitary, immersed to erumpent, uniloculate, globose to subglobose, glabrous, dark brown to black, coriaceous to sub-carbonaceous, with ostiolate papilla. Ostiole central, circular, periphysate. Peridium two-layered, outer layer comprising dark brown to black cells of textura angularis, inner layer comprising hyaline, thick-walled, flattened cells of textura angularis. Pseudoparaphyses numerous, trabeculate, hyaline, distantly septate, branched, persistent, within a gelatinous matrix and anastomosing above asci. Asci 8-spored, bitunicate, fissitunicate, clavate, short pedicellate, apically rounded, with a wide, shallow ocular chamber and faint ring. Ascospores overlapping biseriate, ellipsoidal with pointed ends, straight or curved, dark brown to black, septate, polar cells lighter when young and apical cells with two walls, mostly symmetrical, surrounded by thin, gelatinous, striate layer. Asexual morph: Unknown (adapted from Li et al. 2016).
Type species: Angustospora nilensis Abdel-Aziz
Notes: Angustospora is characterised by globose to subglobose ascomata, fissitunicate, clavate asci, and overlapping biseriate, dark-brown to black ascospores. Angustospora resembles Caryospora in having large ascospores with a median septum and added septa near poles of the ascospores. Angustospora differs from Caryospora in having small ascomata and 8-spored, clavate asci (Barr 1979b, 1990, Hawksworth 1982, Abdel-Wahab & Jones 2000, Raja & Shearer 2008, Zhao & Zhao 2012, Ariyawansa et al. 2015). Angustospora was placed in Testudinaceae based on phylogenetic analyses of SSU and LSU sequence data (Li et al. 2016). Angustospora is a distinct and well-supported genus in Testudinaceae. Molecular markers available for Angustospora are LSU, SSU, RPB2 and TEF-1.
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