Aphanizomenon flos-aquae

Note: Aphanizomenon flos-aquae to date has not been shown to produce microcystins. It may, however, produce the neurotoxic saxitoxins.

Single filaments – often morphologically similar to those of Planktothrix – aggregate to colonies

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Micrograph:

…and these may appear to the naked eye like small bits of cut grass:

– Photos by Katrin Teubner