Thallogen
Pronunciation : Thal"lo*gen
Part of Speech : n.
Etymology : [Gr. -gen.] (Bot.)
Definition : Defn: One of a large class or division of the vegetable kingdom, which includes those flowerless plants, such as fungi, alg?, 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.
Source : Webster's Unabridged Dictionary, 1913