Chroococcales

Chroococcales
Microcystis aeruginosa
Scientific classification
Kingdom:	Bacteria
Subkingdom:	Eubacteria
Phylum:	Cyanobacteria
Order:	Chroococcales von Wettstein von Westerheim
Families
Aphanothecaceae Komárek et al. 2014 Chroococcaceae Nägeli Cyanobacteriaceae Komárek et al. 2014 Cyanothrichaceae Elenkin in Kiselev Entophysalidaceae Geitler Gomphosphaeriaceae Elenkin Microcystaceae Elenkin Stichosiphonaceae Hoffmann, Komárek, & Kaštovský

The Chroococcales are an order of cyanobacteria in some classifications which includes the harmful algal bloom Microcystis aeruginosa. Molecular data indicate that the members of the Chroococcales may not be a clade.

The order is characterized by single, floating cells or colonies which are embedded to a matrix. Also, a lack of differentiation between apical and basal structures exists.

...
Wikipedia