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Anabaena

A genus of Cyanobacteria consisting of trichomes that are untapered with conspicuous Constrictions at cross-walls. A firm individual sheath is absent, but a soft covering is often present. Many species are known worldwide as major components of Freshwater Plankton and also of many saline Lakes. The species Anabaena flos-aquae is responsible for acute Poisonings of various Animals.