Polysiphonia senticulosa
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Polysiphonia
- species: Polysiphonia senticulosa
- Zeebrugge
Flanders
Belgium- Carmel-by-the-Sea
- San Luis Obispo
California
United States