In salty water these cell walls absorb a green stain and turn green
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Detailed Description
This is the second of two microscopic images of potentially toxic cyanobacteria, Microcystis aeruginosa. In both images, the cyanobacteria have been exposed to a green stain.
Image 2: Mycrocystis aeruginosa In water half as salty as seawater. The cell walls are breaking down and the stain has penetrated them, turning the colony green.
Sources/Usage
Public Domain.