Abstract
Four species of Ophiostomataceae have been isolated from dead or injured subalpine fir (Abies lasiocarpa). Two (C. nigra, C. brunnea) are described as new species associated with bark beetle galleries, and two (C. minor, C. penicillata) are species previously reported as associated with bark beetles. Three other new species are described from secondary bark beetles associated with Dendroctonus engelmanni in Picea engelmannii. These are Ceratocystis perfecta, C. tenella, and C. vesca. Two species are reported from aspen (Populus tremuloides) sapwood in Colorado for the first time. C. brevicollis is a new species associated with ambrosia beetles in aspen.