Letharia gracilis Kroken is validated as a new species of lichenized fungi from California and southern Oregon. Previously lumped under L. columbiana, but recognized as a distinct lineage by molecular work of Kroken and Taylor, L. gracilis is distinguished from L. columbiana by its sparse branching, slender, relatively smooth, drooping branches and distinct ITS DNA sequences.
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Vol. 112 • No. 2