usnea

usnea

[uhs-nee-uh]
noun
any pale-green or gray, mosslike lichen of the genus Usnea, common on rocks and trees.

Origin:
1590–1600; < Neo-Latin, Medieval Latin < Arabic or Persian ushnah

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WordNet
usnea

noun
widely distributed lichens usually having a greyish or yellow pendulous freely branched thallus 
WordNet® 3.0, © 2006 by Princeton University.
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