Actinocladium aquaticum J. Yang & K.D. Hyde, sp. nov.

MycoBank number: MB; Index Fungorum number: IF; Facesoffungi number: FoF 12776;

Etymology: referring to the aquatic habitat of the fungus.

Holotype: GZAAS

Saprobic on submerged twig in a freshwater stream. Asexual morph: Colonies on substratum superficial, effuse, hairy, dark brown, scattered or in small groups. Mycelium mostly immersed, composed of branched, septate, pale brown to brown hyphae. Conidiophores macronematous, mononematous, solitary or in small groups, erect, cylindrical, straight or slightly flexuous, smooth-walled, 1–3-septate, dark brown, slightly paler and narrower towards the apex, 36–64 × 3.5–4.5 µm ( = 51 × 4 µm, n = 15). Conidiogenous cells monoblastic, integrated, cylindrical, terminal, determinate, brown, truncate at the apex. Conidia acrogenous, solitary, obpyramidal, with 2–4 arms, septate, brown, 15–20 µm high from the base to the arms intersection from the front view, 13–18 µm wide, arms 6–29 µm long. Sexual morph: Undetermined.