Definition of Protophyta
: a major category of lower plants: such as a in former classifications : a division or other group comprising the algae, fungi, and lichens b in some especially former classifications : a division or other group comprising unicellular plants and including bacteria, yeasts, slime molds, blue-green algae, and various simple green algae —often used as a term of convenience rather than strict taxonomy — compare protista c in some classifications : a division comprising unicellular and noncellular organisms and including blue-green algae, bacteria, rickettsias and related organisms, and viruses —used chiefly in bacteriological taxonomy
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Origin and Etymology of protophyta
New Latin, from prot- + -phyta
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