Leptogium cellulosum and L. teretiusculum are much more frequent and widespread in the Pacific Northwest of North America than previously recognized. Leptogium cellulosum, formerly known from only a few sites, is now known from over 50 sites in the Pacific Northwest. We describe habitat and associated macrolichen and crustose lichen communities for these species. In addition, we examined morphological variation of L. cellulosum in the Pacific Northwest. Three widespread morphological variants of L. cellulosum occurred at similar percentages of plots sampled in northern Idaho. Leptogium teretiusculum is relatively constant in morphology, however it must be carefully distinguished from the terete morph of L. cellulosum.
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Vol. 105 • No. 3