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

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

Gonimia :: Gonimia (n. pl.) Bluish green granules which occur in certain lichens, as Collema, Peltigera, etc., and which replace the more usual gonidia..

Angiocarpous :: Angiocarpous (a.) Having the seeds or spores covered, as in certain lichens..

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

Licheniform :: Licheniform (a.) Having the form of a lichen.

Treebeard :: Treebeard (n.) A pendulous branching lichen (Usnea barbata); -- so called from its resemblance to hair.

Usnea :: Usnea (n.) A genus of lichens, most of the species of which have long, gray, pendulous, and finely branched fronds. Usnea barbata is the common bearded lichen which grows on branches of trees in northern forests..

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..

Spermogonium :: Spermogonium (n.) A conceptacle of certain lichens, which contains spermatia..

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

Lichened :: Lichened (a.) Belonging to, or covered with, lichens..

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..

Fibrillose :: Fibrillose (a.) Covered with hairlike appendages, as the under surface of some lichens; also, composed of little strings or fibers; as, fibrillose appendages..

Lichenologist :: Lichenologist (n.) One versed in lichenology.

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

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

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..

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

Cup-moss :: Cup-moss (n.) A kind of lichen, of the genus Cladonia..