Stock Photo - Rock tripe (Umbilicaria pustulata or Lasallia pustulata) is an umbilicate lichen with the upper thallus surface with convex pustules; its color varies between gray and brown or yellow. This photo was taken in Arribes del Duero Natural Park, Zamora, Spain.

Stock Photo: Rock tripe (Umbilicaria pustulata or Lasallia pustulata) is an umbilicate lichen with the upper thallus surface with convex pustules; its color varies between.

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