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Blue green algae/cyanobacteria

Microcystis aeruginosa


Tiny cocci in loosely spherical/globular arrangement. Colonies extremely mucoid, buoyant and bright green. 400x.


Willamette River shore in an urban area during a very dry period when the water table was low, resulting in an algal bloom that originated in the Ross Island Lagoon and was spread by the current.


I wore gloves and goggles, as this species can potentially produce toxins. Local scientists identified the species, otherwise I would have had no idea.

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Spotted by

Portland, Oregon, USA

Spotted on Jan 23, 2015
Submitted on Sep 27, 2014

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