Aquimassariosphaeria vermiformis L.L Liu, J. Yang & Z.Y. Liu, sp. nov.
MycoBank number: MB 559453; Index Fungorum number: IF 559453; Facesoffungi number: FoF 12787;
Etymology: referring to the vermiform ascospores.
Holotype: GZAAS 20-0390
Saprobic on decaying, submerged wood in freshwater habitats. Asexual morph: Undetermined. Sexual morph: Ascomata on wood (120–)160–210 ×190–320 μm, scattered or gregarious, superficial or immersed, globose or subglobose, papillate, ostiolate, black membranous. Ostiole periphysate. Ascomatal wall 15–50 μm thick, composed of several layers of thick-walled, brown cells of textura globosa, cells becoming hyaline, thin-walled and smaller towards the inner layers. Pseudoparaphyses abundant, hyaline, septate, branched and anastomosing, 2.5–4.8 µm ( = 3.5 μm, n = 20) wide. Asci bitunicate, 95–127 × 14.5–23 μm ( = 110 × 18 μm, n = 20), 8-spored, clavate, with a short pedicel, subapical cytoplasm occupies the whole ascus. Ascospores obliquely biseriate, pale yellowish to yellowish brown, fusiform, straight or slightly curved, 5–8-septate, mostly 7-septate, strongly constricted at the septa, 25–40 × 6–7.7 μm ( = 31 × 7 μm, n = 30), thick-walled, guttulate, smooth-walled, with an ellipsoidal to fusiform mucilaginous sheath.