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

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

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..

Apothecium :: Apothecium (n.) The ascigerous fructification of lichens, forming masses of various shapes..

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..

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

Agar-agar :: Agar-agar (n.) A fucus or seaweed much used in the East for soups and jellies; Ceylon moss (Gracilaria lichenoides).

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

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

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

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..

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

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

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

Orchilla Weed :: Orchilla weed () The lichen from which archil is obtained. See Archil.

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

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

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

Perithecium :: Perithecium (n.) An organ in certain fungi and lichens, surrounding and enveloping the masses of fructification..

Parietic :: Parietic (a.) Pertaining to, or designating, an acid found in the lichen Parmelia parietina, and called also chrysophanic acid..