Mycena rosella, the Pink Bonnet, is a small woodland bonnet distinguished by its bright pink to salmon pink cap and the vividly coloured edge of its gills. It grows exclusively in moist, moss rich coniferous or mixed woods, often in large groups on needle beds, and is typically encountered in autumn. Thanks to its pink colours and striking lamellar edge it is unusually easy to recognise among European Mycenas. White forms are also known.

Cap small, at first parabolical to convex, later almost plane with a slight umbo or sometimes depressed in the centre. The surface is sulcate and translucent-striate, smooth, and glabrous, coloured bright pink to salmon pink or brownish pink, usually darker at the centre with shades of brownish red or sienna. Flesh thin and fragile. Gills 15–18 reaching the stipe, ascending to subhorizontal, broadly adnate and somewhat decurrent, dingy pink to pale pink, minutely spotted with reddish dots from the pleurocystidia. The edge is distinctly brighter, in violet red to brownish red tones. Stem slender, hollow, straight or often curved at the base, pruinose when young, later smooth. Initially dark brown at the apex and paler below, gradually becoming reddish brown to pale pink or yellowish pink, with the base covered in coarse whitish to yellowish fibrils. Spore print white.

Microscopic Features: Spores measuring 7.5–10 × 4–5 µm, pip-shaped, smooth, amyloid, with a Q value of 1.6–2.3 and an average Q of about 1.9.

Mycena rosella on the mycena.no Web site.
Mycena rosella on the mykoweb.com Web site.