Hongkongmyces aquisetosus J. Yang Jian K. Liu & K.D. Hyde, sp. nov.
MycoBank number: MB 559454; Index Fungorum number: IF 559454; Facesoffungi number: FoF 12788;
Etymology: referring to the aquatic habitat and setose ascomata.
Holotype: HKAS 112625
Saprobic on submerged decaying wood. Asexual morph: Undetermined. Sexual morph: Ascomata scattered or gregarious, semi-immersed to superficial, perithecial, 250–350 μm high, 330–370 μm diam., subglobose, dark brown, ostiolate, papillate, covered with sparse pale brown, septate hyphae arising from ascomatal surface. Ostiole periphysate. Ascomatal wall coriaceous, 34–83 μm thick, consisting of multi-layered cells of textura angularis, outer layers with dark brown, polygonal, thick-walled cells, inner layers with pale brown to hyaline, polygonal to elongated, thin-walled cells. Hamathecium composed of compact pseudoparaphyses, 2–3 µm wide, cylindrical, cellular, hyaline, septate, branched. Asci (112–)135–170(–210) × 12.5–15 µm (x̅ = 160 × 13.5 µm, n = 20), bitunicate, fissitunicate, cylindrical to clavate, 8-spored, pedicellate, usually flexuous or slightly curved, with an apical chamber. Ascospores (23.6–)26–34(–36.6) × 5.8–8.6 µm (x̅ = 30 × 7.5 µm, n = 40), overlapping, obliquely 1–2-seriate, narrowly fusiform with pointed ends, straight or slightly curved, yellowish green, 0–1-septate when young, mostly 5-septate when mature, smooth-walled, guttulate, deeply constricted at the septum, surrounded by a mucilaginous sheath.