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Xanthoria parietina ("maritime sunburst lichen") on a marble gravestone, near the coast of Maine. Medieval healers took the color of this lichen as a sign that it was a remedy for jaundice. It is a folk remedy for kidney disorders and several other ailments in parts of Andalucia, Spain. It grows near both the Atlantic and Pacific coasts, but not inland.

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Photograph copyright Stephen/Sylvia Sharnoff