Cladostephus spongiosus
- kingdom: Chromista
- phylum: Ochrophyta
- class: Phaeophyceae
- order: Sphacelariales
- family: Cladostephaceae
- genus: Cladostephus
- species: Cladostephus spongiosus
Nortorf
Schleswig-Holstein
Germany
San Michele di Serino
Campania
Italy
Tossa de Mar
Catalonia
Spain
Bembridge- Berwick-Upon-Tweed
- Bognor Regis
- Brighton
- Brixham
- Broadstairs
- Clacton-on-Sea
- Combe Martin
- Cromer
- Dover
- Falmouth
- Flamborough
- Folkestone
- Framlingham
- Gurnard
- Hartlepool
- Horam
- Hugh Town
- Ilfracombe
- Isles of Scilly
- Paignton
- Penzance
- Polzeath
- Rayne
- Saint Osyth
- Scarborough
- Sidmouth
- Southampton
- Swanage
- Tankerton
- Weymouth
- Whitstable
England- Halkyn
Wales
United Kingdom
Oak Bluffs
Massachusetts- Sound Beach
New York- Newport
Rhode Island
United States
Dee Why