Pseudohalonectria aurantiaca J. Yang, E.B.G. Jones & K.D. Hyde, sp. nov.

MycoBank number: MB 559766; Index Fungorum number: IF 559766; Facesoffungi number: FoF 12828;

Etymology: referring to the orange masses of ascospores.

Holotype: MFLU 15-1174

Saprobic on decaying wood submerged in freshwater. Asexual morph: Undetermined. Sexual morph: conspicuous as black necks on the host surface and masses of orange ascospores on the apex of neck. Ascomata scattered or aggregated, immersed, perithecial, 200–450 × 120–400 μm, subglobose to obpyriform, yellowish brown becoming dark brown, ostiolate, with a 300–530 μm long neck, yellowish brown becoming dark brown. Ostiole periphysate. Ascomatal wall coriaceous, 9–16.5 μm thick, outer layer yellowish brown, undifferentiated from plant tissue, inner layer consisting of hyaline, elongated, thin-walled cells of textura angularis or taxtura prismatic. Paraphyses abundant, persistent, septate, hyaline, unbranched, guttulate, tapering towards the apex, 6–8 μm wide near the base, strongly constricted at the septa. Asci 100–160 × 15–28.5 µm ( = 130 × 21.5 µm, n = 30), fusiform, straight or slightly curved, truncate at the apex, 8-spored, with a non-amyloid, thimble-shaped apical ring. Ascospores (35–)45–60(–70) × 6–9 µm ( = 52 × 7.8 µm, n = 40), overlapping, 2–3-seriate, cylindrical-fusiform, straight or slightly curved, hyaline when young, becoming pale yellow then pale orange, 5-septate, smooth-walled, guttulate, thin-walled.