| thallogen | <botany> 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. Origin: Gr. Young shoot or branch, frond + -gen. Source: Websters Dictionary (01 Mar 1998) |
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