Poria zonataBres., a wood-rotting fungus known only from the western United States and British Columbia, is reported to be widely distributed within that area on recently fallen trees ofAbies grandis, A. concolor, A. lasiocarpa, Larix occidentalis,Pseudotsuga menziesii, andTsuga heterophylla. A description of the sporophores of the fungus, its cultural characteristics, and the white pocket rot caused by it are given.