Callithamnion byssoideum
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Callithamniaceae
- genus: Callithamnion
- species: Callithamnion byssoideum
- Saint Ann’s Bay
St Ann
Jamaica- Swanage
England
United Kingdom- Bridgeport
- Mystic
Connecticut- Edgartown
- Gloucester
- Nantucket
- North Plymouth
- Plymouth
- West Falmouth
Massachusetts- Atlantic City
- Jersey City
New Jersey- Jamestown
- Newport
- Portsmouth
Rhode Island
United States