Cells never have flagella but some can glide using mucilage.
U nicellular, colonial, and filamentous forms, marine, freshwater, and terrestrial. Color generally blue-green to violet, but sometimes red or green, or appearing black in the field. Photosynthesis based on chlorophyll a , as in other algae and green plants, unlike other photosynthetic bacteria . Pigments located on thylakoids, but these are not inside chloroplasts . Phycobilisomes also in Rhodophyta.