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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.
In the Windmill Islands area of continental Antarctica, Usnea sphacelata tends to grow in drier sun-exposed areas where snow does not tend to persist. Typical lichen associates at this location include Buellia frigida, Buellia soredians, Pseudephebe minuscula, and Umbilicaria decussata. [4]
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. It is considered a threatened or vulnerable species in several European countries. [2]
Usnea trichodea, commonly known as bony beard lichen, [1] is a pale straw-colored fruticose lichen with a pendant growth form. It grows on trees and is native to eastern North America. It grows on trees and is native to eastern North America.
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 articulata, commonly known as the string-of-sausage lichen, [1] is a pale greenish-grey, densely branched lichen with a prostrate or pendant growth form. It grows on bark, on branches and twigs, and is often unattached to a branch and merely draped over it. It grows up to 100 cm (40 in) in length. [1]
Usnea pallidocarpa is known to occur only in a single location within the Argentinean Andean Cordillera in the southern part of South America. This lichen is an alpine species, growing at an elevation of about 1800 metres.
Usnea strigosa, commonly known as bushy beard lichen, is a fruticose lichen in the family Parmeliaceae. Distribution Usnea ...