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ABSTRACT
Piptoporus pseudobetulinus causes a white rot and is taxonomically remote from the type of Piptoporus, P. betulinus, which causes a brown rot; the new combination Polyporus pseudobetulinus is proposed. The range of this species is extended from Finland and the U.S.S.R. to include Canada, Austria and Sweden. Fruiting bodies and cultures are described. Hosts and habitats in Eurasia and North America are compared. Its relationship to other polypore genera causing white rots, and the correct type for Polyporus are discussed.