Polysiphonia hapalacantha
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Polysiphonia
- species: Polysiphonia hapalacantha
- George Town
Exuma
Bahamas- Goulding
- Key West
- Pensacola
- Pine Island Center
Florida
United States