Mycena rubromarginata (Fr.) P. Kumm.

Führer Pilzk. (Zwickau): 109 (1871)

© A. Aronsen

VESTFOLD, Tønsberg, Syrrebekk 19 July 2004

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.

Pileus 10-30 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.

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© Arne Aronsen 2002-2023