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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 ...
There are many diseases known to cause ocular or visual changes. Diabetes , for example, is the leading cause of new cases of blindness in those aged 20–74, with ocular manifestations such as diabetic retinopathy and macular edema affecting up to 80% of those who have had the disease for 15 years or more.
Keratosis lichenoides chronica (Nékam's disease) Kraurosis vulvae; Lichen nitidus; Lichen planus actinicus (actinic lichen niditus, actinic lichen planus, lichen planus atrophicus annularis, lichen planus subtropicus, lichen planus tropicus, lichenoid melanodermatitis, lichenoid melanodermatosis, summertime actinic lichenoid eruption)
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 ruber moniliformis, also known as morbus moniliformis lichenoide, Wise-Rein disease, Nekam disease, keratosis lichenoides chronica, is a rare skin disease named for Fred Wise and Charles R. Rein. [1] [2] It is one of several diseases also known as Kaposi's disease, based on its characterization in 1886 by Moritz Kaposi. [1] [3]
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.