Golden eye lichen (Teloschistes chrysophthalmus) growing on blackthorn. This is extremely rare in UK, formerly thought to be extinct.

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Photo credit: © BOB GIBBONS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: biological, biology, blackthorn, botanical, botany, chrysophthalmus, close, close-, eye, flora, golden, golden-eye, lichen, lichens, nature, orange, parasite, parasitic, plant, rare, rarity, teloschistes, yellow