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Usnea is a genus of fruticose lichens in the large family Parmeliaceae.The genus, which currently contains roughly 130 species, was established by Michel Adanson in 1763. . Species in the genus grow like leafless mini-shrubs or tassels anchored on bark or
Growing on a conifer in the hills north of Mount St. Helens, showing the leaf-like side-branches and pendent "stems", some of them several metres long. Dolichousnea longissima (syn. Usnea longissima), [2] [3] commonly known by the names old man's beard or Methuselah's beard lichen, is a fruticose lichen in the family Parmeliaceae.
One of the most potent lichen antibiotics is usnic acid, as a result Usnea spp. are commonly used in traditional medicines. Usnea was used in the United States as a fungal remedy of the mouth, stomach, intestines, anus, vagina, nose, ear, and skin, and in Finland it was used to treat wounds, skin eruptions, and athlete's foot. [5]
The lichen is sensitive to air pollution, and is often used as a biomonitor of sulphur dioxide. [3] Usnea hirta has an extensive worldwide distribution, and it is morphologically variable, which has led to numerous intraspecific taxa (i.e. subspecies , varieties , and forms ) being proposed in its taxonomic history.
Usnea strigosa has worldwide distribution. It is a common tree lichen in Eastern and Southeastern North America. It is a common tree lichen in Eastern and Southeastern North America. [ 1 ] [ 2 ]
Usnea sphacelata is a species of saxicolous (rock-dwelling), fruticose lichen in the large family Parmeliaceae. It is found in both polar regions of Earth , as well as in southern and northern South America and in New Zealand.