Siphonocladus
Siphonocladus is a small genus of green algae in the family Siphonocladaceae. The algal body (thallus) is composed of long, club-shaped cells that divide by segregative cell division, followed by the formation of branches that break through the mother cell. As in other members of the order Cladophorales, cells are multinucleate. The genus occurs in subtropical or tropical seas, in shallow intertidal and subtidal habitats. Most species are rare. References

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Cladophorales genera
Siphonocladaceae