Aqualignicola setosa J. Yang & K.D. Hyde, sp. nov.

MycoBank number: MB 559649; Index Fungorum number: IF 559649; Facesoffungi number: FoF 12806;

Etymology: referring to the setose ascomata.

Holotype: MFLU 22-0057

Saprobic on submerged decaying wood in freshwater habitats. Asexual morph: Undetermined. Sexual morph: Ascomata scattered or gregarious, semi-immersed to mostly superficial, perithecial, 120–180 μm high, 90–160 μm diam., subglobose to conical, dark brown, ostiolate, mostly lying horizontally, with setae 13–40 µm long, 2.2–3 µm wide growing on a cylindrical, laterally upward neck. Ostiole periphysate. Ascomatal wall coriaceous, 16–30 μm thick, 2-layered, outer layer consisting of several rows of dark brown, polygonal, thick-walled cells of textura angularis, inner layer consisting of multi-rows of pale brown to hyaline, polygonal to elongated, thin-walled cells of textura angularis. Paraphyses sparse, persistent, septate, hyaline, tapering towards the apex, 2.5–4 μm wide. Asci (115–)120–160(–170) × 6.5–9 µm ( = 138 × 7.9 µm, n = 20), including a stipe 20–42 µm long, cylindrical, obtuse at the apex, 8-spored, with a non-amyloid apical annulus 1.7–2.8 µm wide, 1.2–2.4 µm high. Ascospores 11.5–15.5(–16.6) × 5–6.5 µm ( = 13.7 × 5.8 µm, n = 50), arranged obliquely uniseriate, narrowly ellipsoidal, hyaline, aseptate, smooth-walled, guttulate.