Cespitose and in dense groups on coniferous
wood (Pinus, Picea).
Late summer to autumn. Widely distributed and many places rather common. Common in Norway. In some countries reported on hardwood but such records should e revised.
mm across, conical to campanulate, becoming more or less
parabolic to convex, translucent-striate, shallowly to hardly
sulcate, somewhat lubricous when wet, hygrophanous, pruinose, glabrescent, fairly dark brown
with white margin in younger specimens, becoming dark brown
to medium brown with darker striae. Lamellae
13-18 reaching the stipe, ascending, narrowly adnate to adnate,
more or less decurrent with a short tooth, grey to dark grey with
pallid to white edge. Stipe 20-70 x 1-2 mm, hollow, fragile, straight to curved, equal, terete, pruinose in the entire length, glabrescent except for the apex, somewhat
lubricous when wet, pale to dark sepia brown, usually paler at the apex, the apex blackish brown in younger
specimens, the base densely covered with long, coarse, flexuous,
white fibrils. Odour nitrous. Taste unpleasant, somewhat astringent.
Basidia 25-30 x
8-9 µm, clavate, 4-spored. Spores
9-11.5 x 5.3-6.5 µm, Q 1.5-2.1, Qav ~ 1.7, pip-shaped to somewhat elongated,
smooth, amyloid. Cheilocystidia
33-45 x 7-14 µm, forming a sterile band, fusiform, subcylindrical, lageniform,
apically with a shorter or longer, simple to furcate neck.
Pleurocystidia absent. Lamellar trama dextrinoid, brownish vinescent in Melzer's reagent. Hyphae
of the pileipellis 2-4.5 µm wide, smooth or covered with
some scattered cylindrical excrescences, embedded in gelatinous
matter. Hyphae of the
cortical layer of the stipe 1.5-3.5 µm wide, embedded in gelatinous
matter, smooth to covered with scattered cylindrical excrescences; the terminal cells
diverticulate, variously shaped. Clamp connections present in all tissues.
More microscopic figures.
Among the numerous nitrous-smelling species
in the genus M. stipata is quite easily recognizable
on account of the densely cespitose growth on coniferous wood and the brown
colours. Mycena silvae-nigrae is a similar-looking, vernal species that differs in having 2-spored basidia and densely diverticulate hyphae of the pileipellis and stipitipellis, in addition to cheilocystidia with +/- coarse excrescences. Mycena leptocephala differs in many aspects. It is rarely fasciculate and has smooth, non-gelatinized hyphae of the stipitipellis and inflated caulocystidia.
Further images on the Internet:
Pilze Pilze Galerie