Abstract
The Swan Valley hosts a rich lichen flora reflecting both continental and Pacific coastal climatic influences. A total of 206 taxa were collected, 74 of which are new records for Montana. Additional localities are given for Collema curtisporum Degel., previously known in North America from a single locality in the state of Washington. Bacidia idahoensis Magn. is reported for the 1st time since its description in 1952. Eastward range extensions of species with Pacific coastal affinities include Cladonia verruculosa, Cetraria orbata, Hypogymnia rugosa and H. metaphysodes.

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