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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. Like other lichens it is a symbiosis of a fungus and an alga. The fungus belongs to the division Ascomycota, while the alga is a member of the division Chlorophyta.
Usnea grows all over the world. This one was observed on the bark of a Holm oak tree
The specimen is very young to specify the species Camera Model: NIKON D300 Exposure Time: 1/4 sec. f/9.0 ISO speed rating 100 Focal Length: 90.0 mm