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From: Webster's Revised Unabridged Dictionary (1913)

 Thal·lo·gen n.  Bot. 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.
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