Chroococcales

Microcystis is a genus of freshwater cyanobacteria that includes the harmful algal bloom-forming Microcystis aeruginosa.

The Chroococcales () are an order of cyanobacteria in some classifications which includes the harmful algal bloom Microcystis aeruginosa. Molecular data indicate that Chroococcales may be polyphyletic, meaning its members may not all belong to the same clade or have the same common ancestor.

Gloeocapsa (from the Greek gloia (gelatinous) and the Latin capsa (case)) is a genus of cyanobacteria. The cells secrete individual gelatinous sheaths which can often be seen as sheaths around recently divided cells within outer sheaths. Recently divided cell pairs often appear to be only one cell since the new cells cohere temporarily. They are also known as glow caps, a term derived from the yellowish hue given off by the cap.

Chroococcus is a genus of cyanobacteria belonging to the family Chroococcaceae.

species of Cyanobacteria

Chroococcaceae is a family of cyanobacteria.

Microcystaceae is family of cyanobacteria which contains the harmful algal bloom Microcystis aeruginosa.

Johannesbaptistia is a genus of brackish–freshwater cyanobacteria which has a very characteristic morphology. It is the only member of the family Cyanothrichaceae. When the name was changed from Cyanothrix to Johannesbaptistia (due to the rules of priority in the International Code of Nomenclature for algae, fungi, and plants), the family name was not changed.

thumb|Gomphosphaeria aponina Kütz., illustration of a colony pressed apart

Gomphosphaeriaceae is a family of cyanobacteria.