Witches' Whiskers lichen (Usnea florida) growing on an oak branch. Powys, Wales. February.

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Photo credit: © Richard Becker / Alamy / Afripics
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Keywords: algae, algal, branch, britain, british, environment, environmental, europe, european, florida, fungi, fungus, lichen, natural, nature, oak, plant, powys, symbiosis, symbiotic, usnea, wales, welsh, whisker, whiskers, wild, wildlife, witches