A small, white, distinctly pubescent-hairy fungus with reduced, fold-like lameelae which do not reach the pileus margin, absence of hymenial cystidia, diverticulate pileipellis hyphae, cylindrical, awl-shaped, narrowly lageniform pileocystidia and setiform caulocystidia.
Pileus 2-5(-10) mm across, hemispherical to convex, often somewhat depressed centrally, sometimes with a small papilla, margin somewhat inflexed and often undulating, opaque or slightly translucent striate, distinctly pubescent to hairy, white. Lamellae 2-10, decurrent, reduced, not reaching the pileus margin, usually fold-like, and sometimes practically absent, white. Stipe 4-8 x 0.2-0.5 mm, cylindrical, distinctly pubescent to hairy, white, base without strigose hairs. Smell indistinct.
Basidia 2-spored. Spores 6.5-8.5(-11) x 4-4.7(-5.5) µm, ellipsoid, subamygdaliform, smooth, non-amyloid. Hymenial cystidia absent. Hymenophoral trama non-dextrinoid. Hyphae of the pileipellis up to 6 µm wide, slightly thick-walled, diverticulate. Pileocystidia (11)35-85 x 3-5.5 µm, cylindrical, narrowly lageniform, awl-shaped, setiform, slightly thick-waleed. Stipitipellis up to 7 µm wide, smooth. Caulocystidia 30-118 x 4.5-7 µm, setiform, awl-shaped, slightly thick-walled. Clamp connections present.
On fallen twigs and leaves of broadleaved trees, rarely coniferous trees. Also found on grass and plant remnants and on fallen cones of conifers. Mostly in wet places. Summer to autumn. Not uncommon in Norway.
Antonín & Noordeloos (2004) descriped a var. tetraspora, which has constantly 4-spored basidia and showing no other differences from the typical variety.
According to Species Fungorum the correct name of this taxon is Hemimycena hirsuta (Tode) Singer, but I have chosen to use the commonly known name which also is in accordance with Funga Nordica (2012).