Mycena renati Quél.

Enchir. fung. (Paris): 34 (1886)

© A. Aronsen
VESTFOLD, Tønsberg, Gullkrona 30 June 2008

In small groups or fasciculate on wood and fallen branches of deciduous trees, e. g. Alnus, Corylus, Fagus. Early summer to early autumn, rarely later. Reaches the northern limit of Corylus in Scandinavia; rare in western parts of the covered area (Belgium, the Netherlands, UK). In Denmark mostly recorded on Fagus with a peak in June. Widely distributed in southern Norway but not common.

Pileus 10-32 mm across, conical, parabolical, finally convex, pruinose, glabrescent, shallowly sulcate, translucent-striate, at first dark reddish brown, becoming paler reddish brown to pinkish brown, darker at the centre. Lamellae 16-20 reaching the stipe, ascending, adnate, decurrent with a short tooth, becoming dorsally intervenose with age, dingy white; the edge concolorous or reddish brown. Stipe 15-65 x 1-2.5 mm, hollow, straight to curved, equal, terete, pruinose, glabrescent, bright yellow, turning brown from the base with age; the base covered with white fibrils. Odour indistinctive to weakly nitrous. Taste reported as slightly raphanoid.

Basidia 23-31 x 7-10 µm, clavate, 4-spored, with sterigmata up to 8 µm long. Spores 8-10.2 x 4.9-6 µm, Q 1.4-1.8, Qav≈1.6, fairly broadly pip-shaped, amyloid. Cheilocystidia 20-63 x 8-14 µm, forming a sterile band, fusiform, rarely lageniform or clavate. Pleurocystidia similar, if present. Lamellar trama dextrinoid. Hyphae of the pileipellis 2.5-12 µm wide, smooth or covered with coarse, rounded, mostly inflated excrescences 5-22.5 x 5-13.5 µm. Hyphae of the cortical layer of the stipe 2.5-3.5 µm wide, smooth or covered with scattered rounded warts or excrescences, the terminal cells 3.5-18 µm wide, coarsely diverticulate. Clamp connections present at all tissues.

Mycena renati is a member of sect. Rubromarginatae, although the colour of the lamellar edge often is absent or hardly noticable, or only visible near the margin of the pileus. It is easily identified because of the red-brown pileus and the bright yellow stipe. Microscopically the inflated excrescences of the hyphae of the pileipellis should be noticed as a reliable character.

M. bresadolana Robich & Neville, recently described from Italy, also has a brigth yellow stipe. It is supposed to differ from M. renati on account of a more lilac-brown pileus, subglobose spores, the hyphae of the pileipellis gelatinizing, and the hyphae of the cortical layer of the stipe smooth.

Robich (2005) described a white form of M. renati as "f. alba".

© A. Aronsen 2004

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