Wood-Staining Fungi Associated with Bark Beetles in Engelmann Spruce in Colorado

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Abstract
SUMMARY Four species of the Ophiostomataceae have been found associated with Dendroctonus engelmanni Hopkins in bark of dying Picea engelmannii Parry in Colorado. Leptographium engelmannii, the perfect stage of which has not been observed, is the most prominent and most consistently associated species, and is described as new. It causes a conspicuous stain in the sapwood of the insect-attacked trees. Ophiostoma truncicola, described as new, is frequently present in main galleries of the beetles. Endoconidiophora coerulescens Münch, is also sometimes present in the galleries and on sapwood of logs cut from beetle infested trees. The fourth fungus, Ophiostoma bicolor Davidson and Wells, described as new, has been isolated once from D. engelmanni adult beetle but was obtained from other sources such as Ips hunter? and Monochamus scutellatus (in Canada). All of these were obtained from bark beetle infested Engelmann spruce in Colorado except that the latter species (O. bicolor) was also obtained from Canada and from other hosts.