On Piloderma bicolor and the closely related P. byssinum, P. croceum, and P. fallax

We confirm an earlier conclusion that two species of mycorrhizal fungi,Piloderma bicolor and P. byssinum, are distinct and that the name P.bicolor has peen correctly applied in North America. We also conclude thatP. fallax is the most appropriate name for what has been called P. bicolorand P. croceum_ Descriptions of the two species are supplemented with linedrawings and photomicrographs