<p><strong>Fig. 2.25.</strong> (<strong>A</strong>) <em>Lyngbya</em> sp. a filamentous cyanobacterium (blue-green algae) under a microscope.</p>

Fig. 2.25. (A) Lyngbya sp. a filamentous cyanobacterium (blue-green algae) under a microscope.

Image courtesy of National Aeronautics and Space Administration (NASA)