Paragaeumannomyces aquaticus J. Yang, Jian K. Liu & K.D. Hyde, sp. nov.
MycoBank number: MB; Index Fungorum number: IF; Facesoffungi number: FoF 12815;
Etymology: referring to the aquatic habitat of the fungus.
Holotype: GZAAS
Saprobic on decaying wood submerged in freshwater. Asexual morph: Undetermined. Sexual morph: Ascomata solitary or gregarious, superficial, perithecial, 180–280 μm high, 150–260 μm diam., globose to ovoid, roughened, dark brown, papillate, ostiolate. with dark brown, stiff, acute setae, 17–38 × 4.7–7.5 µm, clustered around ostiole, loosely scattered over entire surface of the ascoma. Ostiole periphysate. Ascomatal wall leathery, 26–48 μm thick, 3-layered; outer layer of textura angularis, 11–24 µm thick, consisting of multi-layered, thin-walled, globose, subglobose to polyhedral, pale brown cells, 6–12.5 μm diam., grading into smaller cells towards the exterior; middle layer of textura angularis, 13–26 µm thick, composed of multi-layered, thick-walled, polygonal to elongated, smaller, dark brown, melanized cells with setae arising from this layer; inner layer of textura angularis to prismatica, composed of thin-walled, flattened and elongated hyaline cells. Paraphyses numerous, persistent, septate, hyaline, unbranched, tapering towards the apex, 4.3–5 μm wide near the base. Asci 142–165 × 8.5–13 µm ( = 152 × 10.5 µm, n = 20), cylindrical-fusiform, usually curved, with a short pedicel, obtuse at the apex, 8-spored, apex with a small non-amyloid apical annulus. Ascospores 60–73 × 3.5–5.2 µm ( = 66 × 4.3 µm, n = 20), overlapping, filiform, straight, or slightly curved, hyaline, multi-septate, smooth, guttulate, thin-walled, asymmetrical, rounded at the apical end, slightly tapering towards the narrowly rounded basal end.