|obsolete any organism of the former division Thallophyta, lacking true stems, leaves, and roots: includes the algae, fungi, lichens, and bacteria, all now regarded as separate phyla|
|[C19: from New Latin thallophyta, from Greek thallos a young shoot + phuton a plant]|
|thallophyte (thāl'ə-fīt') Pronunciation Key
Any of a former group of plantlike organisms showing no differentiation into stem, root, or leaf. Thallophytes were regarded as constituting a major division of the plant kingdom and included the algae, fungi, and lichens. No longer in scientific use.