China, Hainan province, Limu Mountain, 19°29'40"N, 107°80'45"E, ca. 350 m alt., from leaves of an unidentified dicotyledonous plant submerged in a stream, Apr 2015, Zefen Yu, YMF 1.04260 – holotype; CGMCC 3.19632 – culture ex-type.

ver.mi- (from vermiformis), NL fem. adj mean worm-shaped + spo.ra N.L. fem. S. spora, referred to worm-shaped conidia.

Mycelium partly superficial and partly immersed, composed of septate, branched, smooth, hyaline, 1–2 μm wide hyphae. Conidiophores solitary, macronematous, semimacronematous, erect or prostrate, straight or flexuous, unbranched, up to 4-septate, cylindrical, up to 150 μm long, 3–4 μm wide, pale brown to brown, smooth, sometimes reduced to conidiogenous cells. Conidiogenous cells integrated, terminal, cylindrical to subulate, sometimes lageniform, determinate, smooth, pale brown to brown, mostly darker than conidiophores, phialidic, after secession leaving an inconspicuous basal frill, 12–47 × 2.6–3 μm. Conidia solitary, acrogenous, long lunate, vermiform to sigmoid, unicellular, guttulate, hyaline, smooth-walled, 31–55 × 2.5–3.5 μm, acute at the apex and narrow truncate at the base bearing minute marginal frills and a cellular, single, unbranched, somewhat attenuated or acuminate, eccentric basal appendage, 1.5–4.6 μm long.

Colonies attain 2.4 cm diameter on PDA and 2.8 cm diameter on CMA after 10 days at 25 °C. On PDA, colonies flat to slightly raised, aerial mycelium abundant, margin entire to undulate, surface white initially, then become buff and grey with age, reverse same color. Colonies on CMA, center with aerial mycelium cottony, periphery with scarce aerial mycelium, olivaceous grey, dark green exudate and soluble pigment produced, reverse same color.

The species occurs on submerged leaves in stream. This species is currently known only from the type locality.