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.
Description adapted from: A. Aronsen A Key to the Mycena of Norway 2016 and G. Robich Mycena d'Europa Volume: 1 2003
The combination of a pinkish cap and yellow stem is not found in any other British Mycena species.
In GB&I it has only been recorded from sites in England (VC66 Durham, VC64 Mid-west Yorkshire, VC62 North-east Yorkshire, VC54 North Lincolnshire, VC 8 South Wiltshire and VC13 West Sussex).
Found in small groups or fasciculate (many fruitbodies emerging from the same place) on the decaying wood of deciduous trees, including: Fagus (beech) Quercus (oak), Fraxinus (ash), Alnus (alder) and Corylus (hazel).