any pale-green or gray, mosslike lichen of the genus Usnea, common on rocks and trees.
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How to use usnea in a sentence
We camped in a boggy hollow on a bluff among scraggy, usnea-bearded spruces.Travels in Alaska | John Muir
usnea barbata is collected from trees in Pennsylvania, and used for an orange colour for yarn.Vegetable Dyes | Ethel M. Mairet
It resembles carbonized horse hair and was called "horse hair usnea" by old Dillenius.Synopsis of Some Genera of the Large Pyrenomycetes | C. G. Lloyd
The larger ones covered with lichens,—often hung with the long gray usnea.Cape Cod | Henry D. Thoreau
It was in a section of Mississippi where there was no usnea growing within 60 miles.