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  • Usnea is the generic and scientific name for several species of lichen in the family Parmeliaceae, that generally grow hanging from tree branches, resembling grey or greenish hair. It is sometimes referred to commonly as Old Man's Beard, Beard Lichen, or Treemoss. — “Usnea - Wikipedia, the free encyclopedia”,
  • Neritina usnea. Scientific classification. Kingdom: Animalia. Phylum: Neritina usnea (Röding, 1798) Neritina usnea is a species of sea snail, a marine. — “Neritina usnea - Wikipedia, the free encyclopedia”,
  • Usnea rubicunda (Red beard lichen), is a type of arboreal lichen native to temperate regions in North, Central and South America, as well as Europe, Eastern Asia, and North Africa. This fruticose species forms hair-like hanging clusters that are orange to red in color. — “Usnea rubicunda - Wikipedia, the free encyclopedia”,


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