Neohelicosporium fluviatile J. Yang & K.D. Hyde, sp. nov.

MycoBank number: MB 559606; Index Fungorum number: IF 559606; Facesoffungi number: FoF 12796;

Etymology: referring to the habitat of a stream.

Holotype: MFLU 15-1141

Saprobic on decaying submerged twig in freshwater habitats. Asexual morph: Colonies on natural substratum superficial, effuse, gregarious, white, with glistening conidial masses. Mycelium partly immersed, partly superficial, composed of pale brown to hyaline, septate, branched hyphae. Conidiophores macronematous, mononematous, cylindrical, branched, septate, up to 85 µm long, 3.8–6.4 µm wide, pale brown to hyaline, smooth-walled. Conidiogenous cells monoblastic or polyblastic, integrated, terminal or intercalary, cylindrical, pale brown to hyaline, denticulate, smooth-walled. Conidia holoblastic, solitary, acropleurogenous, helicoid, rounded at both ends, 28–38.4 μm diam. when tightly compact and conidial filament 215–430 × 3–7.4 µm ( = 330 × 5.6 µm, n = 25), tightly coiled 3–4.25 times, becoming loosely coiled in water, indistinctly multi-septate, guttulate, hyaline, smooth-walled, sometimes with pale brown basal cells. Sexual morph: Undetermined.