A stipitate polypore, Polyporus pekingensis J.D. Zhao & L.W. Xu, was originally described from northern China. However, unlike species of the genus Polyporus, it has a distinctly monomitic hyphal structure, and its basidiospores are fusiform. These characters show that the species is more closely related to Jahnoporus Nuss, and the new combination, Jahnoporus pekingensis (J.D. Zhao & L.W. Xu) Y.C. Dai, is proposed. A detailed description and illustrations are supplied from its type material.