Myrionema magnusii
- kingdom: Chromista
- phylum: Ochrophyta
- class: Phaeophyceae
- order: Ectocarpales
- family: Chordariaceae
- genus: Myrionema
- species: Myrionema magnusii
Bognor Regis- Sidmouth
- Swanage
- Weymouth
England- Coylton
Scotland
United Kingdom