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Family: MycenaceaeGenus: Mycena
Cap: 10-32mm, campanulate, campanulate-expanded, finally convex, pruinose, glabrescent, shallowly sulcate, translucent-striate, dark reddish brown at first, becoming paler reddish brown to pinkish brown or pink, darker towards the centre. Gills: 16-26 reaching the stem, ascending, adnate with a short decurrent tooth, broad, intervenose with age; colour white, whitish, gray; concolorous edge which tends to turn reddish or violet-brown. Flesh: similar colour to cap with a brown hue. Stem: 1-2.5 mm x 15-65 mm, hollow, straight to curved, equal, terete, pruinose, glabrescent, uniformly bright yellow, turning brown from the base with age; the base covered with fine white fibrils. Smell indistinct to weakly nitrous. Spores: (4.5) 5-7 x (8) 9-12 (13) µm, Q = 1.4-1.8, Qav = 1.6, fairly broadly ellipsoid or pip-shaped, amyloid. Basidia: 25-34 x 8.5-10, clavate 4- spored. Cheilocystidia: 7-16 x 24-63 μm, fusiform, rarely lageniform (neck narrower than half the width of cell body) or clavate. Hyphae of the pileipellis: 2.5-12 µm wide, smooth or covered with coarse, rounded, mostly inflated excrescences 8-22.5 x 5.5-13.5 µm. Hyphae of the cortical layer of the stipe 2.5-3.5 µm wide, smooth or covered with scattered rounded warts, clamped, the terminal cells coarsely diverticulate. Clamp connections present in all tissues.
Map of known distribution in Great Britain and Ireland.
Description adapted from: A. Aronsen A Key to the Mycena of Norway 2016 and G. Robich Mycena d'Europa Volume: 1 2003