any of the Thallophyta, a plant division in some older classification schemes, comprising algae, fungi, and lichens.

1850–55; < Neo-Latin Thallophyta group name. See thallus, -o-, -phyte

thallophytic [thal-uh-fit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thallophyte (ˈθæləˌfaɪt)
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
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.
The American Heritage® Science Dictionary
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