Noun genus usnea has 1 sense
  1. Usnea, genus Usnea - widely distributed lichens usually having a grayish or yellow pendulous freely branched thallus
    --1 is a kind of fungus genus
    --1 is a member of Usneaceae, family Usneaceae
    --1 has members: beard lichen, beard moss, Usnea barbata
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