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ABSTRACT
Boletus piperatoides, until now only known from Michigan, is shown to have a transcontinental distribution in North America and is not uncommon in northern California. This taxon is transferred to Chalciporus and compared to C. piperatus with which it is most similar. The description of C. piperatoides adds new information to the circumscription of this taxon. A technique for identifying collections of C. piperatoides from herbarium material is also described.