Polysiphonia tongatensis
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Polysiphonia
- species: Polysiphonia tongatensis
- Saint George
Saint George
Bermuda- Enewetak
Enewetak Atoll
Marshall Islands