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