thallogens is a form of:

Thallogen



Same as: thallophyte
ENGLISH MEANING
noun
1.
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.