usnea(redirected from Tree-moss)
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Any of various widely distributed lichens of the genus Usnea, characterized by a pendulous, usually branched thallus, often growing on trees.
[From Arabic 'ušna, moss; akin to Persian ušna.]
(Plants) a lichen that hangs from tree branches. Also called: old man's beard
us•ne•a(ˈʌs ni ə)
n., pl. -ne•as.
any pale green or gray, mosslike lichen of the genus Usnea, common on rocks and trees.
[1590–1600; < New Latin, Medieval Latin < Arabic or Persian ushnah]
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|Noun||1.||Usnea - widely distributed lichens usually having a greyish or yellow pendulous freely branched thallus|
fungus genus - includes lichen genera
family Usneaceae, Usneaceae - fruticose lichens having prostrate or erect or pendulous thalli: genera Usnea, Evernia, Ramalina, Alectoria