Abstract
Hypotrachyna riparia is described as a new species of lichenized fungus from Oregon, U.S.A. Morphologically similar to H. gondylophora, H. riparia is separated from that species by shorter, more richly branched rhizines and the presence of salazinic rather than fumarprotocetraric acid. For several years I actively looked for Hypotrachyna revoluta (Florke) Hale in the Pacific Northwest. It was known from California (Hale & Cole 1988) and British Columbia (Ohlsson 1973), so it was logical that it should be found in Oregon. Eventually I did find it in Oregon (several locations from Newport north to Cascade Head in Tillamook County), but in the process of searching for it, I also found an undescribed species of Hypotrachy-
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