Nostocales

Nostocales
	Anabaena flos-aquae
Scientific classification
Domain:	Bacteria
Phylum:	Cyanobacteria
Class:	Cyanophyceae
Order:	Nostocales; T.Cavalier-Smith
Families[1][2]
	Aphanizomenonaceae Elenkin; Capsosiraceae (Geitler) Elenkin; Chlorogloeopsidaceae (Mitra) Mitra & Pandey; Fortieaceae; Gloeotrichiaceae Komárek et al. 2014; Godleyaceae Hauer, Mareš, Bohunická, Johansen, & Berrendero-Gomez; Hapalosiphonaceae Elenkin; Nostocaceae C. A. Agardh ex Kirchner; Rivulariaceae Kützing ex Bornet & Flahault; Scytonemataceae Rabenhorst ex Bornet & Flahault; Stigonemataceae Borzì; Symphyonemataceae Hoffmann, Komárek, & Kaštovský; Tolypothrichaceae Hauer, Mareš, Bohunická, Johansen, & Berrendero-Gomez;
Synonyms
	Hormogonales;

The Nostocales are an order of cyanobacteria containing most of its species. It includes filamentous forms, both simple or branched, and both those occurring as single strands or multiple strands within a sheath. Some members show a decrease in width from the base, and some have heterocysts.

References

Komárek J, Kaštovský J, Mareš J, Johansen JR (2014). "Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach" (PDF). Preslia. 86: 295–335.
"Nostocales on www.bacterio.cict.fr". Archived from the original on 2012-03-19. Retrieved 2010-11-04.

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[Komárek-1] Komárek J, Kaštovský J, Mareš J, Johansen JR (2014). "Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach" (PDF). Preslia. 86: 295–335.

[2] "Nostocales on www.bacterio.cict.fr". Archived from the original on 2012-03-19. Retrieved 2010-11-04.