These small, stalkless, white mushrooms are sometimes mistaken for small oyster mushrooms, Pleurotus ostreatus. Crepidotus species have brown spore prints whereas oysters have a white to lilac spore prints.
The small white, shell-shaped caps range from ½ to 1 5/8 inches (1 to 4 cm) wide. They are not very fleshy unlike oyster mushrooms. The caps are directly attached to the dead hardwood substrate. The close to crowded white gills soon become brown as the spores develop. Flat creps grow on dead hardwood logs and stumps. The season ranges from July to October. The spore print is brown.