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The Oedogoniales are an order of filamentous freshwater green algae of the class Chlorophyceae. The order is well-defined and has several unique features, including asexual reproduction with that possess stephanokont flagella: numerous short flagella arranged in a subapical whorl. The oedogoniales have a highly specialized type of oogamy, and an elaborate method of cell division which results in the accumulation of apical caps.
The order comprises one family, Oedogoniaceae, with three genera.Silva, Paul C; Moe, Richard L (2003). " Oedogoniales ". McGraw-Hill Encyclopedia of Science & Technology Online. Retrieved on July 16, 2006. Some common features among these genera may be obscure. The hairs of Bulbochaete and the heterotrichous system Oedocladium are similar to Chaetophorales, with which they may share a distant relationship.Bell, Peter R; Hemsley, Alan R (September 28, 2000). Green Plants. Cambridge University Press. . pps. 50-1. Of the genus Oedogonium there are over 330 species, about 70 species of Bulbochaete, and 10 species of Oedocladium. More than half of these species are known to North America.Tiffany, L. H. (1955). Geographic Distribution of the North American Species of the Oedogoniaceae. American Journal of Botany. pps. 293-4. Many of the species are used by aquarium owners.[[File:Oedogoniales025 repro.jpg|thumb|Oedogoniales: cell division and sexual reproduction]]
Members of the order usually inhabit still waters such as lakes and ponds, rather than rivers and streams. The oedogoniales include free-living and epiphyte members on other algae or freshwater .
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