ABSTRACTThe status of the species namesMeripilus giganteus, Grifola lentifrondosa, andG. sumstineiis reviewed with regard to synonymy. Data from studies of nomenclatural types by light and scanning electron microscopy indicate that they represent three distinct species. Data from studies of cultures ofM. giganteusandG. sumstineialso indicate that these two names represent separate taxa.Meripilus giganteusandG. sumstineiare typified. The new combinations,Meripilus sumstineiandMeripilus lentifrondosa, are proposed. We conclude thatM. giganteusdoes not occur in North America. A key to the species ofMeripilusis provided, and pathogenicity and edibility ofM. giganteusandM. sumstineiare discussed.