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

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

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..

Usnic :: Usnic (a.) Pertaining to, or designating, a complex acid obtained, as a yellow crystalline substance, from certain genera of lichens (Usnea, Parmelia, etc.)..

Parelle :: Parelle (n.) A kind of lichen (Lecanora parella) once used in dyeing and in the preparation of litmus.

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

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

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

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

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..

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

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

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

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..

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

Erythrite :: Erythrite (n.) A colorless crystalline substance, C4H6.(OH)4, of a sweet, cooling taste, extracted from certain lichens, and obtained by the decomposition of erythrin; -- called also erythrol, erythroglucin, erythromannite, pseudorcin, cobalt bloom, and under the name phycite obtained from the alga Protococcus vulgaris. It is a tetrabasic alcohol, corresponding to glycol and glycerin..

Lichenographic :: Lichenographic (a.) Alt. of Lichenographica.

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..

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.