Usnea, also known as Old Man's Beard, growing on branches of a Ponderosa Pine tree along Oregon's Grande Ronde River.

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Photo credit: © Leon Werdinger / Alamy / Afripics
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Keywords: america, beard, county, eastern, lichen, man, north, northeast, oregon, pine, plant, ponderosa, states, tree, united, usnea, vertical, wallowa