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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.
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]
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.
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 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 ]
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 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 poliothrix is an irregular, orange species of Usnea, a common fruticose lichen. [1] It has soralia with prominent isidiofibril growth. [ 2 ] Its orange cortex is very fragile, and often scarred by the marks of lost isidiofibrils. [ 1 ]