Siphonales
plural noun
Si·phon·ales
| \ sīfəˈnā(ˌ)lēz\
Definition of Siphonales
: an order of marine and freshwater green algae (class Chlorophyceae) whose filaments consist essentially of a large multinucleate cell with cross walls rare and usually only adjacent to reproductive organs — compare codium , siphonocladales
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