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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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..

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..

Excipulum :: Excipulum (n.) The outer part of the fructification of most lichens.

Manna :: Manna (n.) A name given to lichens of the genus Lecanora, sometimes blown into heaps in the deserts of Arabia and Africa, and gathered and used as food..

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

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

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

Amphigenous :: Amphigenous (a.) Increasing in size by growth on all sides, as the lichens..

Litmus :: Litmus (n.) A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein..

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

Roccellic :: Roccellic (a.) Pertaining to, or designating, a dibasic acid of the oxalic series found in archil (Roccella tinctoria, etc.), and other lichens, and extracted as a white crystalline substance C17H32O4..

Trica :: Trica (n.) An apothecium in certain lichens, having a spherical surface marked with spiral or concentric ridges and furrows..

Cudbear :: Cudbear (n.) A powder of a violet red color, difficult to moisten with water, used for making violet or purple dye. It is prepared from certain species of lichen, especially Lecanora tartarea..

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..

Patella :: Patella (n.) A kind of apothecium in lichens, which is orbicular, flat, and sessile, and has a special rim not a part of the thallus..

Lichenology :: Lichenology (n.) The science which treats of lichens.

Lirella :: Lirella (n.) A linear apothecium furrowed along the middle; the fruit of certain lichens.

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

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

Lecanoric :: Lecanoric (a.) Pertaining to, or designating, an organic acid which is obtained from several varieties of lichen (Lecanora, Roccella, etc.), as a white, crystalline substance, and is called also orsellic, / diorsellinic acid, lecanorin, etc..