Polysiphonia pacifica
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Polysiphonia
- species: Polysiphonia pacifica
- Nanaimo
- North Saanich
- Prince Rupert
- Sooke
- Tofino
- Victoria
British Columbia
Canada- Diamond Ridge
- Homer
- Sitka
Alaska- Monterey
- Pacific Grove
- Pacifica
- Santa Cruz
California- Brookings
Oregon
United States