: any of a genus (Usnea of the family Parmeliaceae) of widely distributed lichens (such as old-man's beard) that have a grayish or yellow pendulous freely branched thallus
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The usnea—also called old-man's beard—looked ethereal in the dappled afternoon sunlight.
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Hannah Wallace, Condé Nast Traveler, 6 Aug. 2021
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Hannah Wallace, Condé Nast Traveler, 6 Aug. 2021
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“Usnea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/usnea. Accessed 22 Dec. 2024.
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