Category:Thallogen

Thal"lo*gen, n. Etym: [gr. -gen.] (bot.)

Defn: one of a large class or division of the vegetable kingdom, Which includes those flowerless plants, such as fungi, algæ, 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.