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Field of Umbilicaria vellea
Rock lichens, Umbilicaria vellea
Rock lichens, Umbilicaria vellea
Umbilicaria dillenii
Umbilicaria dillenii
Umbilicaria dillenii
Umbilicaria muhlenbergii
Umbilicaria muhlenbergii
Umbilicaria muhlenbergii
Umbilicaria muhlenbergii