On moss-covered trunks of deciduous trees,
e. g. Fagus, Salix, Ulmus. Summer to winter. Records
in The Norwegian Mycology Database.
Pileus 2-10 mm
across, campanulate, conical, sometimes becoming convex to applanate,
with or without a small papilla, shallowly sulcate, translucent-striate, glabrescent, very variable in colours, fairly dark brown with the centre blackish brown, turning paler brown with age or at
first pale grey-brown and dark brown at the centre, paler
with age, becoming very pale brown to beige, mostly darker
at the centre, sometimes entirely white, the margin usually white. Lamellae 8-14
reaching the stipe, ascending, narrowly to more broadly adnate, pale grey to white. Stipe
10-35 x 0.5-1 mm, hollow, curved, terete, equal, pruinose or minutely puberulous, glabrescent except for a pruinose apex,
white, occasionally yellowish towards the base
with age, the base covered with long, coarse, flexuous white fibrils. Odour
Basidia 25-35 x 6-7 µm, clavate, 2-spored,
clampless (4-spored, clamped specimens may occur). Spores
7-9.5 x 5.2-7 µm, Q = 1.1-1.5, Qav ~ 1.3, broadly pip-shaped, smooth, non-amyloid.
30-50 x 9-14 µm, forming a sterile band, clamped
or clampless, fusiform to utriform, smooth, usually broadly
rounded. Pleurocystidia similar,
if present. Lamellar trama weakly reddish brown in Melzer's reagent. Hyphae
of the pileipellis 2-4 µm wide, sparsely diverticulate, covered with usually simple, more rarely furcate, cylindrical, straight to curved excrescences 2-9 x 1-3 µm. Hyphae of the cortical layer of the stipe
2-6 µm wide, smooth, terminal
cells (caulocystidia) 12-23 x 4-10 µm, variously shaped,
Mycena hiemalis is a member of sect.
& Maubl. Usually it can be recognized by the growth
on moss-covered trunks of deciduous trees, the usually pale pileus
generally with a brownish centre, and the ascending, narrowly
adnate lamellae. It can, however, sometimes be confused
with M. alba (Bres.) Kühner.
or with M. olida Bres.
M. alba can be distinguished
by the hyphae of the pileipellis that are covered with scattered,
coarse, inflated, simple or broadly lobed excrescences,
and by the globose spores. M. olida
differs in having a whitish pileus with a yellowish centre, smooth hyphae of the pileipellis and somewhat
differently shaped cheilocystidia. Dark brown specimens of M. hiemalis can be confused with M. erubescens, but the latter is easily separated microscopically.
Further images on the Internet: