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SUMMARY
New species, Ceratocystis ponderosae, isolated from blue stain of ponderosa pine, and C. fraxinopennsylvanica, isolated from brown stain associated with bark beetle larvae galleries in green ash, are described. Ceratocystis ponderosae is morphologically similar to C. pilifera but differs in growth habit and staining ability. The ostiolar tip and imperfect state of C. fraxinopennsylvanica separate this species from others.