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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Mycose :: Mycose (n.) A variety of sugar, isomeric with sucrose and obtained from certain lichens and fungi. Called also trehalose..

Lichenographist :: Lichenographist (n.) One who describes lichens; one versed in lichenography.

Cetraric :: Cetraric (a.) Pertaining to, or derived from, the lichen, Iceland moss (Cetaria Islandica)..

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

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

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

Lichen :: 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

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..

Lirella :: Lirella (n.) A linear apothecium furrowed along the middle; the fruit of certain lichens.

Maplike :: Maplike (a.) Having or consisting of lines resembling a map; as, the maplike figures in which certain lichens grow..

Podetium :: Podetium (n.) A stalk which bears the fructification in some lichens, as in the so-called reindeer moss..

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..

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

Evernic :: Evernic (a.) Pertaining to Evernia, a genus of lichens; as, evernic acid..

Ascospore :: Ascospore (n.) One of the spores contained in the asci of lichens and fungi. [See Illust. of Ascus..

Lichenin :: Lichenin (n.) A substance isomeric with starch, extracted from several species of moss and lichen, esp. from Iceland moss..

Eschara :: Eschara (n.) A genus of Bryozoa which produce delicate corals, often incrusting like lichens, but sometimes branched..

Cudbear :: Cudbear (n.) A powder of a violet red color, difficult to moisten with water, used for making violet or purple dye. It is prepared from certain species of lichen, especially Lecanora tartarea..

Gonimous :: Gonimous (a.) Pertaining to, or containing, gonidia or gonimia, as that part of a lichen which contains the green or chlorophyll-bearing cells..

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