Siphonales

plural noun

Si·​phon·​ales

sīfəˈnā(ˌ)lēz

: 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

Word History

Etymology

New Latin, from siphon- + -ales

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