Crusty navel lichen, Umbilicaria crustulosa, on acid rock-face, high in the Pyrenees; Andorra

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Photo credit: © Bob Gibbons / Alamy / Afripics
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Keywords: alp, alpine, alps, altitude, crustulosa, crusty, fungi, fungus, high, lichen, lichen-rich, lichenised, lichenized, lichens, montagnes, montane, mountain, mountainous, mountains, navel, plant, rock, rock-dwelling, rock-loving, saxicole, saxicolous, symbiosis, umbilicaria, upland, uplands