Solitary or subfasciculate on decaying wood
and stumps of various deciduous trees. Early summer to autumn. Widely distributed in Norway, although not very common. See the records in The Norwegian Mycological Database.
mm across, parabolical to convex, with or without a low
umbo, flattening with age, translucent-striate, sulcate,
hygrophanous, at first very dark brown or black-brown, soon
fading to grey-brown to grey, sometimes nearly whitish,
the margin paler to almost white. Lamellae
25 - 30 reaching the stipe, ascending, narrowly adnate,
smooth to veined, pale grey to white, sometimes tinged pinkish
or incarnate. Stipe 25-80 x
3-8 mm, equal, terete, straight to curved, hollow, fragile,
finally innate-fibrillose and with a satiny sheen, pruinose
above and glabrous farther below, pale bluish white or greyish
white when very young, gradually turning white, the base
usually darker, more or less densely covered with white
fibrils. Odour nitrous, but often
weak or even absent.
Basidia 30-36 x 7-9 μm,slender-clavate,
2-spored or 4-spored, without or with clamps. Spores
(basidia 4-spored) 8-11.2 x 5.2-7 μm, q = 1.2 - 1.7, qav ~ 1.5 or (basidia 2-spored)11.6-14.8
x 6.7-8.1 μm , pip-shaped, smooth,
40-110 x 9-22 x 0-4.5 μm, fusiform, lageniform, conical,
subcylindrical, clavate, smooth, apically broadly rounded
or gradually to more abruptly tapered into a shorter or
longer neck, without or with clamps. Pleurocystidia
similar. Lamellar trama dextrinoid, brownish vinescent in Melzer's reagent. Hyphae
of the pileipellis 2-4.5 μm wide, smooth, not embedded
in gelatinous matter. Hyphae
of the cortical layer of the stipe 3-4.5 μm wide, smooth,
not gelatinized, with caulocystidia
6-9 μm wide, smooth to somewhat branched.
The description above has mainly been taken
from Maas Geesteranus (1992: 265-266).
Microphotos of cheilocystidia and pileipellis.
Mycena niveipes usually occurs early
in the season (May - July), but it can also be found in
the autumn. It can usually be identified on account of the
satiny sheen on the stipe and the microscopic features:
the large, smooth cystidia and the smooth hyphae of the
pileipellis and the cortical layer of the stipe
It is a member of sect. Fragilipedes (Fr.) Quél. and young specimens may be confused with M. algeriensis. Generally the latter species is darker in older specimens, the stipe is elastic-cartilaginous, and the hyphae of the pileipellis are embedded in gelatinous matter. M. niveipes may also sometimes resemble M. galericulata, a species of sect. Mycena, but that species can easily be distinguished on account of completely different cheilocystidia and diverticulate hyphae of the pileipellis.
According to Maas Geesteranus (1988a: 266) M. niveipes occurs both in a 2-spored and a 4-spored form, both either with or without clamps.
Further images on the web: