Rhizocarpon quinonum, a new anthraquinone-containing species from the Alaska Peninsula

Abstract

AbstractRhizocarpon quinonumMcCune, Timdal & Bendiksby is described as a new species from two sites in Katmai National Park, south-western Alaska, in a suboceanic climate near the limit of trees on the Alaska Peninsula. Most similar in external appearance toR. arctogenum,R. bolanderi,R. leptolepis, andR. rittokense, the species is distinguished by the presence of an anthraquinone as a major substance. Mature apothecia are unknown, but ITS sequences are most similar to those ofR. copelandiiandR. jemtlandicum, although those species differ greatly in morphology fromR. quinonum.