Abstract
Asexual ascomycetes were isolated from Polygraphus polygraphus or Hylurgops palliatus (Coleoptera: Scolytidae) (NISK-93-208/44 and NISK-94-166/39, respectively) in a Norway spruce (Picea abies) forest. Although the two fungal isolates are distinct in appearance and display specificity to different hosts, the isolates are genetically identical in the nuclear encoded small subunit, large subunit, and internal transcribed spacer rRNA gene regions that we sequenced. Phylogenetic analyses and observations based on DNA placed the Norwegian isolates in an Ophiostoma clade. Within the clade the isolates occurred in a subclade with O. ulmi and O. piliferum and several Ambrosiella species (A. macrocarpa, A. tingens, and A. ips). A second subclade contained additional species of Ophiostoma and Ambrosiella. The beetle vectors of the fungi have different flight times and host tree usage, suggesting that their behavior helps to isolate the fungi in time and space.
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