Hormogonales

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The term "Hormogonales" is no longer in use. It once indicated an order inside the class Cyanobacteria comprising the former suborders "Nostocales", "Scytonematales" and Stigonematales. Some species belonging to Hormogonales would be Anabaena, Nostoc, Rivularia, Scytonema, Stigonema.

see also: http://www.taxonomy.nl/Main/Classification/593.htm http://sn2000.taxonomy.nl/Taxonomicon/TaxonTree.aspx?id=593&tree=0.1&syn=1