Ophioceras thailandense J. Yang, E.B.G. Jones & K.D. Hyde, sp. nov.
MycoBank number: MB 559765; Index Fungorum number: IF 559765; Facesoffungi number: FoF 12827
Etymology: referring to the country Thailand where the fungus was collected.
Holotype: MFLU 15-1138
Saprobic on decaying wood submerged in freshwater. Asexual morph: Undetermined. Sexual morph: Ascomata solitary or in small groups, immersed or semi-immersed, perithecial, 100–350 μm high, 80–200 μm diam., globose to subglobose, dark brown, ostiolate, with a long neck 1–1.5 mm. Ostiole periphysate. Ascomatal wall coriaceous, 9–24 μm thick, consisting of multi-layered, polyhedral cells of textura angularis, outer layer dark brown, becoming pale brown to hyaline at inner layer. Paraphyses numerous, persistent, septate, hyaline, unbranched, tapering towards the apex, 5–7 μm wide near the base, slightly constricted at the septa. Asci 80–110 × 7–11.5 µm ( = 95 × 9.7 µm, n = 25), cylindrical to fusiform, usually curved, obtuse at the apex, 8-spored, with a non-amyloid apical ring. Ascospores 75–91 × 2–3 µm ( = 83 × 2.6 µm, n = 20), parallel, filiform, straight to slightly curved, hyaline, multi-septate, smooth-walled, guttulate, thin-walled.