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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 twigs.
Usnea florida is a species of beard lichen in the family Parmeliaceae. It was first described by Carl Linnaeus in his 1753 work Species Plantarum . German botanist Friedrich Heinrich Wiggers transferred it to the genus Usnea in 1780.
Usnea mayrhoferi has a stiff, compact, and erect-shrubby appearance. Its branches are non-inflated and adorned with abundant tubercles, fibrils, and isidiofibrils.The base of the trunk is distinctly blackened, and annular (ring-like) cracks extend along the basal branches.
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.
Usnea lambii is a small species of fruticose lichen in the family Parmeliaceae. [2] It was first formally described as a new species in 1954 by Henry Imshaug . It has a bipolar distribution, that is, it occurs at both of Earth's polar regions .
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.