Sirogonium is a genus of filamentous charophytegreen algae of the orderSpirogyrales. It is found in freshwater areas on all continents but Antarctica. Spirogyra measures approximately 32–115μm in width. Each cell contains 2–10 chloroplasts in a ribbon, in contrast to the closely related genus Spirogyra, which has chloroplasts in a coil.[1][2]Molecular phylogenetic studies have placed Sirogonium inside a clade consisting of Spirogyra species; in other words, Spirogyra is paraphyletic with respect to Sirogonium.[3]
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↑Drummond, Christopher S.; Hall, John; Karol, Kenneth G.; Delwiche, Charles F.; McCourt, Richard M. (2005). "Phylogeny of Spirogyra and Sirogonium (Zygnematophyceae) Based on Rbcl Sequence Data1". Journal of Phycology. 41 (5): 1055. doi:10.1111/j.1529-8817.2005.00130.x. S2CID49230141.
↑Hall, John D.; Karol, Kenneth G.; McCourt, Richard M.; Delwiche, Charles F. (2008). "Phylogeny of the Conjugating Green Algae Based on Chloroplast and Mitochondrial Nucleotide Sequence Data". Journal of Phycology. 44 (2): 467–477. doi:10.1111/j.1529-8817.2008.00485.x. PMID27041201. S2CID25289006.
John Whitton, B.A. and Brook, A.J. (editors) 2002. The Freshwater Algal Flora of the British Isles. Cambridge University Press, Cambridge. ISBN0-521-77051-3.
