A lichen of the genus Usnea growing on the trunk of a tree in rural woodlands. Lichens are sensitive to air pollution. Dorset England UK GB

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Photo credit: © www.pqpictures.co.uk / Alamy / Afripics
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Keywords: air, dorset, genus, habitat, habitats, indicator, lichen, lichens, pollution, sensitive, uk, usnea, woodland, woodlands