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Abstract
Ceratocystiopsis brevicomi sp. nov. is a mycangial fungus of the western pine beetle, Dendroctonus brevicomis (Coleoptera: Scolytidae). The new species is closely related to C. ranaculosus from D. frontalis and C. collifera from D. valens but can be distinguished by the size of the perithecia and ascospores. Isozyme analysis supports the delimitation of C. brevicomi from C. ranaculosus, C. collifera and C. minuta. However, C. ranaculosus is difficult to distinguish from C. collifera morphologically or by isozymes. The mating system of C. brevicomi is similar to that of C. ranaculosus, which is heterothallic, and perithecia are formed only in pairings between strains of opposite mating type.