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
CanadaDiamond Ridge
Homer
Sitka
AlaskaMonterey
Pacific Grove
Pacifica
Santa Cruz
CaliforniaBrookings
Oregon
United States