thallophyte

noun

thal·​lo·​phyte ˈtha-lə-ˌfīt 

: any of a group of plants or plantlike organisms (such as algae and fungi) that lack differentiated stems, leaves, and roots and that were formerly classified as a primary division (Thallophyta) of the plant kingdom

thallophytic

ˌtha-lə-ˈfi-tik 

adjective

Word History

Etymology

ultimately from Greek thallos + phyton plant — more at phyto-

First Known Use

1854, in the meaning defined above