Caps are tiny (4-12 mm across), convex to bell-shaped, smooth, dry, radially-grooved, bright pinkish brown to red-brown. Flesh thin, reviving when wet. Gills are attached, whitish, narrow, well-separated. Stalks are up to 5 cm tall, wiry, black. Spore prints are white. Widespread but uncommon, it fruits on the ground in mixed woods and is recognized amongst Marasmius species by its colour.
Marasmius rotula - Pinwheel Marasmius