photosynthetic algae which contain chlorophyll and store starch in discrete chloroplasts. They are eukaryotic and most live in fresh water, ranging from unicellular flagellates to more complex multicellular forms.
Cyanobacteria also known as Cyanophyta, is a phylum of bacteria that obtain their energy through photosynthesis. The name "cyanobacteria" comes from the color of the bacteria. They are often called blue-green algae.