The Chroococcales (/ˌkroʊəˌkɒˈkeɪliːz/[2]) are an order of cyanobacteria in some classifications which includes the harmful algal bloom Microcystis aeruginosa.
[3] 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.
[1] 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.
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