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

As a result of recent genetic analyses, several new genera were erected from this genus: e.g., Limnococcus.

The genus has a cosmopolitan distribution.

Species:

• Chroococcus batavus Joosten
• Chroococcus cimneticus Ong
• Chroococcus cohaerens (Bréb.) Nägeli
• Chroococcus dispersus (Keissl.) Lemmermann
• Chroococcus hansgirgi Schmidle
• Chroococcus minor (Kütz.) Nägeli
• Chroococcus minutus (Kütz.) Nägeli
• Chroococcus turgidus (Kütz.) Nägeli
• Chroococcus yellowstonensis J.J.Copeland

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