plural noun
Pro·​toph·​y·​ta | \prəˈtäfətə\

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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History and Etymology for Protophyta

New Latin, from prot- + -phyta

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