Pleurotus ostreatus
"Phyllotopsis subnidulans", found in the eastern US, is similar in appearance to "P. nidulans". The former species can be distinguished by a deeper orange color, thinner gills with wider inter-gill spacing, and curved to sausage-shaped spores. Other similar species include "Lentinellus ursinusus", "Crepidotus mollis", "Panus rudis", "Panus conchatus", and "Pleurotus ostreatus".