Polysiphonia mutabilis
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Polysiphonia
- species: Polysiphonia mutabilis
Benalla
VictoriaEast Fremantle
Fremantle
North Fremantle
Western Australia
Australia