Definition of lichen

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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..

Lern More About Lichen

Lichenous :: Lichenous (a.) Of, pertaining to, or resembling, lichens; abounding in lichens; covered with lichens..
Licheniform :: Licheniform (a.) Having the form of a lichen.
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..
Lichenographical :: Lichenographical (a.) Of or pertaining to lichenography.
Maplike :: Maplike (a.) Having or consisting of lines resembling a map; as, the maplike figures in which certain lichens grow..
Scutellum :: Scutellum (n.) A rounded apothecium having an elevated rim formed of the proper thallus, the fructification of certain lichens..
Scyphus :: Scyphus (n.) A cup-shaped stem or podetium in lichens. Also called scypha. See Illust. of Cladonia pyxidata, under Lichen..
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..
Perithecium :: Perithecium (n.) An organ in certain fungi and lichens, surrounding and enveloping the masses of fructification..
Angiocarpous :: Angiocarpous (a.) Having the seeds or spores covered, as in certain lichens..
Lirella :: Lirella (n.) A linear apothecium furrowed along the middle; the fruit of certain lichens.
Persis :: Persis (n.) A kind of coloring matter obtained from 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).
Lichenin :: Lichenin (n.) A substance isomeric with starch, extracted from several species of moss and lichen, esp. from Iceland moss..
Shield :: Shield (n.) In lichens, a Hardened cup or disk surrounded by a rim and containing the fructification, or asci..
Lichenologist :: Lichenologist (n.) One versed in lichenology.
Lichenic :: Lichenic (a.) Of, pertaining to, or obtained from, lichens..
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..
Fibrillose :: Fibrillose (a.) Covered with hairlike appendages, as the under surface of some lichens; also, composed of little strings or fibers; as, fibrillose appendages..
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