Definition of lichen

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Lichen (n.) 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..

Lern More About Lichen

Lichenography :: Lichenography (n.) A description of lichens; the science which illustrates the natural history of lichens.
Evernic :: Evernic (a.) Pertaining to Evernia, a genus of lichens; as, evernic acid..
Rhizine :: Rhizine (n.) A rootlike filament or hair growing from the stems of mosses or on lichens; a rhizoid.
Lichenographist :: Lichenographist (n.) One who describes lichens; one versed in lichenography.
Cetrarin :: Cetrarin (n.) A white substance extracted from the lichen, Iceland moss (Cetraria Islandica). It consists of several ingredients, among which is cetraric acid, a white, crystalline, bitter substance..
Frond :: Frond (n.) The organ formed by the combination or union into one body of stem and leaf, and often bearing the fructification; as, the frond of a fern or of a lichen or seaweed; also, the peculiar leaf of a palm tree..
Lichenographical :: Lichenographical (a.) Of or pertaining to lichenography.
Cup-moss :: Cup-moss (n.) A kind of lichen, of the genus Cladonia..
Apothecium :: Apothecium (n.) The ascigerous fructification of lichens, forming masses of various shapes..
Lichenologist :: Lichenologist (n.) One versed in lichenology.
Roccellic :: Roccellic (a.) Pertaining to, or designating, a dibasic acid of the oxalic series found in archil (Roccella tinctoria, etc.), and other lichens, and extracted as a white crystalline substance C17H32O4..
Mycose :: Mycose (n.) A variety of sugar, isomeric with sucrose and obtained from certain lichens and fungi. Called also trehalose..
Lichenographic :: Lichenographic (a.) Alt. of Lichenographica.
Excipulum :: Excipulum (n.) The outer part of the fructification of most lichens.
Lirella :: Lirella (n.) A linear apothecium furrowed along the middle; the fruit of certain lichens.
Scyphus :: Scyphus (n.) A cup-shaped stem or podetium in lichens. Also called scypha. See Illust. of Cladonia pyxidata, under Lichen..
Litmus :: Litmus (n.) A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein..
Perithecium :: Perithecium (n.) An organ in certain fungi and lichens, surrounding and enveloping the masses of fructification..
Gonimous :: Gonimous (a.) Pertaining to, or containing, gonidia or gonimia, as that part of a lichen which contains the green or chlorophyll-bearing cells..
Lichenous :: Lichenous (a.) Of, pertaining to, or resembling, lichens; abounding in lichens; covered with lichens..
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