Callithamnion tetricum
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Callithamniaceae
- genus: Callithamnion
- species: Callithamnion tetricum
Roscoff
A2
FrancePorto
Vila Nova de Gaia
PortoAreosa
Viana do Castelo
Viana do Castelo
PortugalHugh Town
Isles of Scilly
Penzance
Salcombe
Sidmouth
England
United Kingdom