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Nodularia
''Nodularia'' is a genus of filamentous nitrogen-fixing cyanobacteria, or blue-green algae.〔Jiří Komárek and Tomáš Hauer〕 They occur mainly in brackish or salinic waters, such as the hypersaline Makgadikgadi Pans,〔C. Michael Hogan, 2008〕 the Peel-Harvey Estuary in Western Australia or the Baltic Sea. ''Nodularia'' cells occasionally form heavy algal blooms. Some strains produce a cyanotoxin called nodularin R, which is harmful to humans. The type species for the genus is ''Nodularia spumigena'' Mertens ex Bornet & Flahault, 1886. ==Morphology== ''Nodularia'' is forms solitary filaments or groups of filaments. They reproduce by the formation of hormogonia, filament breakage, and by akinetes .〔Martin Dworkin and Stanley Falkow, 2006〕
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