Lichens with Oceanic Affinities in the Bitterroot Mountains of Montana and Idaho

Abstract

The inland extension of Pacific maritime influence along the U.S.-Canada border supports a distinctive lichen flora. Previously reported in North America from only near-coastal locations Bacidia herrei, Caloplaca atrosanguinea, Pannaria mediterranea, and Toninia squalida were found in the Bitterroot Mountains of Montana and Idaho. Also new to the Rocky Mountains are Hydrothyria venosa and Umbilicaria havaasii. Disjunct populations of some arctic-alpine species and an anomalous Buellia were found on peaks and ridges.