usnea
nounAny of various widely distributed lichens of the genus Usnea, characterized by a pendulous, usually branched thallus, often growing on trees.
nounA small genus of gymnocarpous parmeliaceous lichens, typical of the family Usneëi.
nounA genus of lichens, most of the species of which have long, gray, pendulous, and finely branched fronds.
A
widely distributed lichens usually having a greyish or yellow pendulous freely branched thallus