Floristic survey of epiphytic lichens and bryophytes growing on old-growth conifers in western Oregon

Using direct-aid climbing techniques for sampling trunks andbranch systems, we found 74 species of lichens and 32 species of bryophytesgrowing as epiphytes in a 450-year-old Douglas fir forest in western Oregon.Six epiphyte zones are described: base, moist side of trunk, dry side of trunk,upper trunk, axes of branch systems and branchlets of branch systems. The floraof each zone is compared with that of the rest of the tree and with that found onunderstory vegetation.