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ABSTRACT
Morphology of basidiospores and pilocystidia of specimens of Ganoderma colossum, G. zonatum, G. oregonense, and G. meredithae was compared. Structure of basidiospores was similar in all species, but basidiospores of some species differed in length, width, spore index, and shape and distribution of inter-wall pillars. Basidiospores of G. zonatum were cylindrical, while those of the other species were ovate with truncated apex. Basidiospores of Ganoderma colossum had angular inter-wall pillars while those of the remaining species were cylindrical. Pilocystidia were davate and unbranched for most species, but those of G. zonatum were highly branched or lobed. Pilocystidia of G. colossum were thin-walled, negative to weakly amyloid. Those of G. zonatum were thick-walled, negative to weakly amyloid, while those of the remaining species studied were thick-walled and strongly amyloid. Host relationships are reviewed and known geographical distributions are indicated for each of the species studied.