Polysiphonia mollis
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Polysiphonia
- species: Polysiphonia mollis
- Benalla
Victoria- East Fremantle
- Fremantle
- North Fremantle
Western Australia
Australia- ‘Āhuimanu
Hawaii
United States