Crepidotus applanatus
This shelving white mushroom grows on wood. The gills turn brown as the spores mature. In Phyllotus porrigens (Angels Wings) and Pleurotus ostreatus (Oyster Mushroom) the gills remain white (white-spored).
Caps are bracket-form, laterally attached, convex to flat, shell-shaped to fan-shaped, 1-3 cm, dry, smooth, white. Gills are attached, narrow, close, white becoming brown. Stalks are absent or very short, with a hairy base. Spore print is brown. Widespread and common, it fruits on rotting logs and stumps.