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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.
Usnic acid was identified in many genera of lichens including Usnea, Cladonia, Hypotrachyna, Lecanora, Ramalina, Evernia, Parmelia and Alectoria. Although it is generally believed that usnic acid is exclusively restricted to lichens, in a few unconfirmed isolated cases the compound was found in kombucha tea and non-lichenized ascomycetes. [4] [5]
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 ...
Usnea galapagona is a species of beard lichen in the family Parmeliaceae. [2] It is endemic to the Galápagos Islands. The lichen is easily recognized by its special structure. It has a tough, glass-like outer layer, a thick central core, and a very faint, almost invisible inner layer. This lichen stands upright and has a reddish colour near ...
Usnea subcomplecta is believed to be endemic to the Galápagos Islands, where it is a common species. It thrives in the humid and upper transition zones, as well as in some high-altitude dry zones. The lichen is usually found in open, often disturbed habitats such as farmland areas, fence posts, and trees along pastures.
Usnea glabrescens is a species of beard lichen in the family Parmeliaceae. It grows on bark , has a shrubby thallus with a blackened base, and a thick cortex . Several chemotypes of this species have been reported.