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During the studied austral summer period, the lichen was only physiologically active for about 27% of the time, primarily when moistened by snow, producing approximately 3.44 g carbon per square meter. This productivity is significantly lower than laboratory studies had suggested, highlighting the challenges of survival in the Antarctic ...
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 hirta is a species of beard lichen in the family Parmeliaceae. It was one of 80 lichen species first formally described by Carl Linnaeus in his 1753 work Species Plantarum . Friedrich Heinrich Wiggers transferred it to the genus Usnea in 1780. [ 2 ]
Usnea glabrata is a species of beard lichen in the family Parmeliaceae. It was first described as a variety of Usnea plicata by Erik Acharius. Finnish lichenologist Edvard August Vainio transferred it to the genus Usnea in 1915. [2] The lichen grows on bark and is widespread throughout Europe, although it is probably locally extinct in a few
Usnea scabrida is a foliose lichen that grows from holdfasts on trees. [1] [2] It occurs in southwest Western Australia. [3] It is a very pale grayish-yellowish green, slender, pendant, branching from the base, unequally branching, and shrubby. [3] The cortex contains usnic acid, and the medulla contains scabrosins. [4]
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.
The lichen was described as new to science in 2011 by the lichenologists Camille Truong and Philippe Clerc. The type specimen was collected by the authors from San Cristóbal Island . The lichen was found in the transition zone at Cerro Mundo, near the summit at an elevation of 282 m (925 ft).
Usnea pallidocarpa is characterised by its shrubby, erect appearance and a thallus (the body of the lichen) that typically measures between 5 and 7 cm in length. This lichen originates from a holdfast , which is the anchoring part of the lichen, appearing either unpigmented or with a brownish hue.