Umbilicaria mammulata lichen, a type of rock-tripe on vertical rock-face, Catskill Mountains, New York State.

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Photo credit: © Bob Gibbons / Alamy / Afripics
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Keywords: catskill, eatable, edible, lichen, lichens, mammulata, mountains, plant, rock-face, rock-tripe, saxicolous, state, symbiosis, umbilicaria, york