horsehair lichen

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Noun1.horsehair lichen - any of several lichens of the genus Alectoria having a thallus consisting of filaments resembling hair
lichen - any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.
Alectoria, genus Alectoria - lichens having dark brown erect or pendulous much-branched cylindrical thallus