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ABSTRACT
The status of the species names Meripilus giganteus, Grifola lentifrondosa, and G. sumstinei is 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 of M. giganteus and G. sumstinei also indicate that these two names represent separate taxa. Meripilus giganteus and G. sumstinei are typified. The new combinations, Meripilus sumstinei and Meripilus lentifrondosa, are proposed. We conclude that M. giganteus does not occur in North America. A key to the species of Meripilus is provided, and pathogenicity and edibility of M. giganteus and M. sumstinei are discussed.