Sirogonium

Sirogonium
Sirogonium
Scientific classification
Clade:	Viridiplantae
(unranked):	Charophyta
Class:	Zygnematophyceae
Order:	Zygnematales
Family:	Zygnemataceae
Genus:	Sirogonium Kützing 1843
Type species
Sirogonium sticticum (Smith) Kützing
Species
21; see text.

Sirogonium is a genus of filamentous charophyte green algae of the order Zygnematales. It is found in freshwater areas on all continents but Antarctica. Spirogyra measures approximately 32–115 μm 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]

Species

The following species are currently accepted:[4]

• Sirogonium calosporum Zhu
• Sirogonium ceylanicum Wittrock
• Sirogonium decoratum Prescott
• Sirogonium denticulatum W.J.Zhu
• Sirogonium floridanum (Transeau) G.M.Smith
• Sirogonium fuscosporum Woodhead & Tweed
• Sirogonium guangzhouense Zhu
• Sirogonium hui (L.C.Li) Transeau
• Sirogonium illinoisense (Transeau) G.M.Smith
• Sirogonium indicum Singh
• Sirogonium inflatum Dixit
• Sirogonium kamatii Kadlubowska
• Sirogonium khoriense Masud-ul-Hassan & M.Nizamuddin
• Sirogonium melanosporum (Randhawa) Transeau
• Sirogonium phacosporum Skuja
• Sirogonium pseudofloridanum (Prescott) Transeau
• Sirogonium reticulatum Randhawa
• Sirogonium retroversum H.C.Wood
• Sirogonium sticticum (Smith) Kützing
• Sirogonium vandalurense Iyengar
• Sirogonium ventersicum Transeau

References

1. 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. S2CID 49230141.
2. 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. PMID 27041201. S2CID 25289006.
3. Chen, Charlotte; Barfuss, Michael HJ; Pröschold, Thomas; Schagerl, Michael (2012). "Hidden genetic diversity in the green alga Spirogyra (Zygnematophyceae, Streptophyta)". BMC Evolutionary Biology. 12: 77. doi:10.1186/1471-2148-12-77. PMC 3527229. PMID 22655677.
4. "Sirogonium Kützing, 1843, nom. cons. :: Algaebase". algaebase.org. Retrieved 2015-11-14.

• John Whitton, B.A. and Brook, A.J. (editors) 2002. The Freshwater Algal Flora of the British Isles. Cambridge University Press, Cambridge. ISBN 0-521-77051-3.