On fallen branches and decaying wood of
both conifers and deciduous trees. On conifer stumps and
on (moss-covered) bark of living deciduous trees. Summer to autumn. Widespread in the area covered. Widely
distributed in Norway. Common on Salix in alpine areas, but more common on conifer in the lowlands.
mm across, conical to parabolical, flattening with age,
glabrous, sulcate, translucent-striate, grey to grey-brown,
pale brown to fairly dark brown, sometimes but not always
with a pinkish or vinaceous tinge, darker at the centre,
the margin often very pale. Lamellae
15-22 reaching the stipe, ascending, adnate, becoming
dorsally intervenose with age, whitish to whitish grey or
grey, sometimes with a pink tinge; the edge vinaceous brown,
red-brown to pale brown, in older specimens more brown,
the colour more prominent near the stipe. Stipe
10-60 x 1-2 mm, hollow, equal to somewhat widened below,
terete, straight to curved, pruinose to finely puberulous,
glabrescent for the greater part, shiny, concolorous with
the pileus, dark grey-brown to pale brown, often with a
faint vinaceous shade, pallescent with agethe base densely
covered with white fibrils. Odour and taste indistinctive
Basidia 28-34 x 8-12 µm, clavate,
4-spored, with sterigmata up to 8 µm long. Spores 9.2-13.4 x 6-9.4 µm, Qav 1.3-1.8, Qav 1.4-1.6, broadly pip-shaped to almost
subglobose, smooth, amyloid. Cheilocystidia
23-70 x 6.5-17 µm, forming a sterile band, fusiform
to subcylindrical or lageniform, with reddish brown contents,
apically mostly narrowed into a simple or branched neck
or into several necks, but sometimes clavate without a neck.
Pleurocystidia not observed. Lamellar trama dextrinoid. Hyphae
of the pileipellis 3-7 µm wide, covered with simple
to branched excrescences 2-28 x 1.5-3.5 µm, forming dense masses. Hyphae
of the cortical layer of the stipe 1.5-4 µm wide, smooth
to sparsely covered with simple to branched, cylindrical excrescences 2-14 x 1-2.8 µm; terminal
cells up to 9 µm wide, cylindrical to somewhat clavate,
covered with simple to branched, cylindrical excrescences 1-20 x 1-3 µm. Clamp connections present in all tissues.
Microphotos of cheilocystidia, spores and pileipellis
Microphoto of pileipellis and stipitipellis.
In sect. Rubromarginatae
there are several species with a reddish
brown lamellar edge. In Mycena
renati the lamellar edge sometimes
is red-brown, but it can easily be separated from M.
rubromarginata on account of the bright yellow stipe
and the broadly rounded warts and inflated excrescences
of the hyphae of the pileipellis.
M. capillaripes has a nitrous smell and
the sides of the lamellae are densely punctate with minute,
red-brown dots (pleurocystidia). M.
purpureofusca differs in lacking clamps, having cheilocystidia apically broadly rounded
and more violaceous, purplish colours.
Both M. sanguinolenta and M. haematopus can be mistaken for M. rubromarginata if the reddish latex is overlooked. The former has more pointed cystidia and the latter simple, fusiform/lageniform cystidia and very pruinose fruitbodies.
Go to Sect. Rubromarginatae