Frosted Rock Tripe (Umbilicaria americana) #lichen commonly found on rockfaces (granitic) in American West, upper Midwest and Northeast U.S. Rounded, grey/brownish-grey in color between 1-3"diameter with black rhizines (rootlike structures) on underside. Seen year round.pic.twitter.com/BhzdWqedeA
12:34 PM - 22 Jan 2021
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