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

Orsellic :: Orsellic (a.) Pertaining to, or designating, an acid found in certain lichens, and called also lecanoric acid..

Hyphae :: Hyphae (n. pl.) The long, branching filaments of which the mycelium (and the greater part of the plant) of a fungus is formed. They are also found enveloping the gonidia of lichens, making up a large part of their structure..

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..

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

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

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..

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..

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..

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

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

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

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

Athalamous :: Athalamous (a.) Not furnished with shields or beds for the spores, as the thallus of certain lichens..

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

Lichenographical :: Lichenographical (a.) Of or pertaining to lichenography.

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

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

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

Lichenous :: Lichenous (a.) Of, pertaining to, or resembling, lichens; abounding in lichens; covered with lichens..