Old Man's Beard, Beard Lichen, or Treemoss, Tikal, Guatemala, Usnea is the generic and scientific name for several species of lichen in the family Par

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Old Man's Beard, Beard Lichen, or Treemoss, Tikal, Guatemala, 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

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Photo credit: © Robert Pickett / Alamy / Afripics
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Keywords: america, central, family, fungi, guatemala, lichen, nature, plants, tree