The Blue-green Algae
The algae are not a group of related forms; in fact, various forms
of alga are assigned to different kingdoms. Because they have
no nuclei, the blue-green algae are assigned to the kingdom
Monera. They are prokaryotic. Members of the three phyla
Euglenophyta, Chrysophyta, and Pyrrophyta are assigned to the kingdom
Protista because none of the members of these phyla are multicellular.
Members of the phyla Chlorophyta, Rhodophyta, and Phaeophyta are
assigned to the kingdom Plantae. These assignments have both positive and
negative implications; they are also tentative.
