Cyanobacteria (IMAGE) GFZ Helmholtz-Zentrum für Geoforschung Caption Light microscope images of blue-green algae from a surface water sample taken from Tiefer See in July 2019: Anabaena sp. (left), Synechococcus sp. (right). Scale length: 100 micrometer each. Credit Ebuka Nwosu Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.