Various species of
Crepidotus,
Hohenbuehelia, and
Panellus are similar in appearance but are inedible or of unknown edibility. They differ most obviously in that they are relatively small (under 6 cm broad) and not generally as white. The edible
Pleurotus populinus differs in that the cap is whitish but not ivory white, the flesh is thicker, and it fruits in the spring on
aspens and
cottonwoods.
See also
Pleurotus ostreatus.