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

Lern More About Lichen

Lirella :: Lirella (n.) A linear apothecium furrowed along the middle; the fruit of certain lichens.
Excipulum :: Excipulum (n.) The outer part of the fructification of most 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..
Lichenologist :: Lichenologist (n.) One versed in lichenology.
Trica :: Trica (n.) An apothecium in certain lichens, having a spherical surface marked with spiral or concentric ridges and furrows..
Ascospore :: Ascospore (n.) One of the spores contained in the asci of lichens and fungi. [See Illust. of Ascus..
Ascus :: Ascus (n.) A small membranous bladder or tube in which are inclosed the seedlike reproductive particles or sporules of lichens and certain fungi.
Parietic :: Parietic (a.) Pertaining to, or designating, an acid found in the lichen Parmelia parietina, and called also chrysophanic acid..
Agar-agar :: Agar-agar (n.) A fucus or seaweed much used in the East for soups and jellies; Ceylon moss (Gracilaria lichenoides).
Eschara :: Eschara (n.) A genus of Bryozoa which produce delicate corals, often incrusting like lichens, but sometimes branched..
Lichenous :: Lichenous (a.) Of, pertaining to, or resembling, lichens; abounding in lichens; covered with lichens..
Cetrarin :: Cetrarin (n.) A white substance extracted from the lichen, Iceland moss (Cetraria Islandica). It consists of several ingredients, among which is cetraric acid, a white, crystalline, bitter substance..
Areola :: Areola (n.) An interstice or small space, as between the cracks of the surface in certain crustaceous lichens; or as between the fibers composing organs or vessels that interlace; or as between the nervures of an insect's wing..
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.
Scyphus :: Scyphus (n.) A cup-shaped stem or podetium in lichens. Also called scypha. See Illust. of Cladonia pyxidata, under Lichen..
Lichened :: Lichened (a.) Belonging to, or covered with, lichens..
Rhizine :: Rhizine (n.) A rootlike filament or hair growing from the stems of mosses or on lichens; a rhizoid.
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..
Crottles :: Crottles (n. pl.) A name given to various lichens gathered for dyeing.
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