Chaetomorpha melagonium
- kingdom: Plantae
- phylum: Chlorophyta
- class: Ulvophyceae
- order: Cladophorales
- family: Cladophoraceae
- genus: Chaetomorpha
- species: Chaetomorpha melagonium
Swanage
England
United Kingdom
Dutch Harbor- Unalaska
Alaska- Gloucester
Massachusetts- Hampton
New Hampshire- Newport
Rhode Island
United States