English definition of Lichen

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Definition of lichen

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Lichen (n.) One of a class of cellular, flowerless plants, (technically called Lichenes), having no distinction of leaf and stem, usually of scaly, expanded, frond-like forms, but sometimes erect or pendulous and variously branched. They derive their nourishment from the air, and generate by means of spores. The species are very widely distributed, and form irregular spots or patches, usually of a greenish or yellowish color, upon rocks, trees, and various bodies, to which they adhere with great

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Archil :: Archil (n.) A violet dye obtained from several species of lichen (Roccella tinctoria, etc.), which grow on maritime rocks in the Canary and Cape Verd Islands, etc..

Excipulum :: Excipulum (n.) The outer part of the fructification of most lichens.

Scutellum :: Scutellum (n.) A rounded apothecium having an elevated rim formed of the proper thallus, the fructification of certain lichens..

Scyphus :: Scyphus (n.) A cup-shaped stem or podetium in lichens. Also called scypha. See Illust. of Cladonia pyxidata, under Lichen..

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..

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..

Rhizine :: Rhizine (n.) A rootlike filament or hair growing from the stems of mosses or on lichens; a rhizoid.

Shield :: Shield (n.) In lichens, a Hardened cup or disk surrounded by a rim and containing the fructification, or asci..

Cudbear :: Cudbear (n.) A lichen (Lecanora tartarea), from which the powder is obtained..

Soredium :: Soredium (n.) A patch of granular bodies on the surface of the thallus of lichens.

Crottles :: Crottles (n. pl.) A name given to various lichens gathered for dyeing.

Tartareous :: Tartareous (a.) Having the surface rough and crumbling; as, many lichens are tartareous..

Patella :: Patella (n.) A kind of apothecium in lichens, which is orbicular, flat, and sessile, and has a special rim not a part of the thallus..

Lichenic :: Lichenic (a.) Of, pertaining to, or obtained from, lichens..

Lichen :: 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..

Persis :: Persis (n.) A kind of coloring matter obtained from lichens.

Orcin :: Orcin (n.) A colorless crystalline substance, C6H3.CH3.(OH)2, which is obtained from certain lichens (Roccella, Lecanora, etc.), also from extract of aloes, and artificially from certain derivatives of toluene. It changes readily into orcein..

Lichenography :: Lichenography (n.) A description of lichens; the science which illustrates the natural history of lichens.

Thallogen :: Thallogen (n.) One of a large class or division of the vegetable kingdom, which includes those flowerless plants, such as fungi, algae, and lichens, that consist of a thallus only, composed of cellular tissue, or of a congeries of cells, or even of separate cells, and never show a distinction into root, stem, and leaf..

Erythrine :: Erythrine (n.) A colorless crystalline substance, C20H22O10, extracted from certain lichens, as the various species of Rocella. It is a derivative of orsellinic acid. So called because of certain red compounds derived from it. Called also erythric acid..