Neomassariosphaeria aquimucosa L.L. Liu, J. Yang & Z.Y. Liu sp. nov.

MycoBank number: MB 559446; Index Fungorum number: IF 559446; Facesoffungi number: FoF 12780;

Etymology: referring to the aquatic habitat of the fungus and the gelatinous sheath of conidia.

Holotype: GZAAS 20-0395

Saprobic on decaying, submerged wood in freshwater habitats. Asexual morph: Undetermined. Sexual morph: Ascomata on wood (148–)225–303 × (116–)164–255 μm, scattered or gregarious, immersed, lenticular or depressed ellipsoidal, papillate, ostiolate, staining the substrate purple, visible as a black, slightly protruding elongate papilla on the substrate. Ascomatal wall coriaceous, 19.5–64.5 μm thick, consisting of several layers of polygonal, pale brown to hyaline cells of textura angularis. Hamathecium composed of dense, filiform, septate pseudoparaphyses, 1.5–3 µm wide, anastomosing above the asci. Asci 111.5–188 × 15–19.5 μm ( = 131.5 × 17.8 μm, n = 20), bitunicate, fissitunicate, cylindrical-clavate, straight or curved, 8-spored, with a subapical ocular chamber and a short furcate pedicel. Ascospores 28.5–40.2 × 6.2–9.6 μm ( = 34.5 × 7.7 μm, n = 30), overlapping, bi- to tri-seriate, fusiform, slightly curved, pale yellow when young, yellowish brown when mature, often broadest at the third cell from the apex, the apical cell usually broader than the basal cell, rounded at both ends, 5–8-septate, constricted at the septa, verruculose, sometimes with a gelatinous sheath.