Pluteus tomentosulus
This mushroom has a white, woolly cap, free gills and a pinkish spore print. The gills are white at first but turn pinkish as the spores mature. These features, plus its occurrence on rotting logs, make it easy to identify.
Caps are 2.5-7.5 cm, conical to bell-shaped, becoming flat and umbonate, whitish, tinged pinkish and cottony to woolly. Gills are free, white, becoming pink. Stalks are up to 10 cm tall by 8 mm wide, and white with a fuzzy surface. The spore print is pink. Widespread but not common.