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