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Lichen

- Noun

A name given to several varieties of skin disease, esp. to one characterized by the eruption of small, conical or flat, reddish pimples, which, if unchecked, tend to spread and produce great and even fatal exhaustion.


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  • Licheń

  • Lichen

    Lichen

    A lichen (/ˈlaɪkən/, LEYE-ken or (USA) /ˈlɪtʃən/, LICH-en ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship. The combined lichen has properties different from those of its component organisms. Lichens come in many colors, sizes, and forms. The properties are sometimes plant-like, but lichens are not plants. Lichens may have tiny, leafless branches (fruticose ), flat leaf-like structures (foliose ), flakes that lie on the surface like peeling paint (crustose ), a powder-like appearance (leprose ), or other growth forms.

  • Byssoid lichen

    A Byssoid lichen is a lichen with a wispy growth form, having the appearance of teased wool. Coenogonium implexum is a byssoid lichen.

  • Lichen stromatolite

    Lichen stromatolites are laminar calcretes that are proposed as being formed by a sequence of repetitions of induration followed by lichen colonization. Endolithic lichens inhabit areas between grains of rock, chemically and physically weathering that rock, leaving a rind, which is then indurated (hardened), then recolonized.

  • Filamentous lichen

    A filamentous lichen is a lichen that has a growth form like a mass of thin, stringy, non-branching hairs or filaments. Filaments of the photosynthetic partner (Trentepohlia ) or trichome -forming (cyanobacteria ) are surrounded by sheaths of the fungal filaments. So unlike in most other lichen growth forms, the filaments of fungus do not determine the shape. Filamentous lichens may look like matted black hair.

  • Saxicolous lichen

    A saxicolous lichen is a lichen that grows on rock. The prefix "sax" from the Latin saxum means "rock" or "stone".

  • Localized lichen myxedematosus

    Localized lichen myxedematosus is a group of skin condition caused by fibroblasts producing abnormally large amounts of mucopolysaccharides, a disease for which there is no treatment. []

  • Lecanorine lichen

    Lecanorine lichen

    A lichen has lecanorine fruiting body parts if they are shaped like a plate with a ring around them, and that ring is made of tissue similar to the main non-fruiting body part of the lichen. The name comes from the name of the lichen genus Lecanora , whose members have such apothecia. If a lichen has lecanorine apothecia, the lichen itself is sometimes described as being lecanorine.

  • Lichen Peak

    Lichen Peak (76°56′S 145°24′W ) is a peak standing between Saunders Mountain and the Swanson Mountains in the Ford Ranges of Marie Byrd Land, Antarctica. It was discovered in December 1934 by the Byrd Antarctic Expedition sledge party under Paul Siple, and so named because of the lichens and other botanical specimens obtained there.

  • Lichen scrofulosorum

    Lichen scrofulosorum is a rare tuberculid that presents as a lichenoid eruption of minute papules in children and adolescents with tuberculosis. The lesions are usually asymptomatic, closely grouped, skin-colored to reddish-brown papules, often perifollicular and are mainly found on the abdomen, chest, back, and proximal parts of the limbs. The eruption is usually associated with a strongly positive tuberculin reaction. Of the three tuberculids, the incidence of lichen scrofulosorum was found to be the lowest (2%) in a large study conducted in Hong Kong. This highlights its rarity and significance as an important marker of undetected tuberculosis.

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