Herposiphonia rigida
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Herposiphonia
- species: Herposiphonia rigida
- Sooke
British Columbia
Canada- Avalon
- Carmel-by-the-Sea
California
United States