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The lichen has a cosmopolitan distribution, and is most common in dry, sun-exposed areas with a temperate climate, in both the Northern and Southern Hemispheres. [11] It is often localized and rare in many parts of its range. [12] Colonies most often form along coastal areas. It is a twig species, meaning that it grows on twigs. It is rarely ...
List of lichen products Chemical spot tests on the foliose lichen Punctelia borreri showing thallus (top) and medulla (bottom). The pinkish-red colour change of the medulla in the C and KC tests indicate the presence of gyrophoric acid , a chemical feature that helps to distinguish this lichen from similar species in the same genus.
But sometimes the parts of a lichen species common name are common names of other lichen genera. For example, Psilolechia lucida, in the genus Psilolechia, is commonly called "sulphur dust lichen". [1] [2] But "sulphur lichen" refers to the genus Fulgensia, and "dust lichen" refers either to the genus Chrysothrix or the genus Lepraria. [1] [3 ...
Lichen spinulosus is a rare skin disorder characterized by follicular keratotic papules that are grouped into large patches. [2] It is a variant of keratosis pilaris named for its resemblance to a patch of lichen .
Lichen simplex chronicus (LSC) is thick leathery skin with exaggerated skin markings caused by sudden itching and excessive rubbing and scratching. [1] It generally results in small bumps, patches, scratch marks and scale. [1] It typically affects the neck, scalp, upper eyelids, ears, palms, soles, ankles, wrists, genital areas and bottom. [1]
Lichen nitidus is a chronic inflammatory disease of unknown cause [1] characterized by 1–2 mm, discrete and uniform, shiny, flat-topped, pale flesh-colored or reddish-brown papules [2] [3] that may appear as hypopigmented against dark skin.
In North America, one vernacular name for the lichen is pink bull's-eye lichen. [ 4 ] Placopsis lambii is distinguished by its placodioid thallus that features deeply notched and radiating edge lobes , a glossy upper surface, typically dark and somewhat rounded soralia , and non-lobate cephalodia that may be absent in certain samples.
Lichen amyloidosis is a cutaneous condition characterized by the appearance of occasionally itchy lichenoid papules, typically appearing bilaterally on the shins. [ 4 ] : 521 Histopathology of lichen amyloidosis, with subepithelial Congo red -positive deposits