Polysiphonia stricta
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Rhodomelaceae
- genus: Polysiphonia
- species: Polysiphonia stricta
North Saanich- Victoria
British Columbia- Yarmouth
Nova Scotia- Gaspé
Quebec
Canada
Byrum
North Denmark
Denmark
Helgoland- Langballig
- Nortorf
Schleswig-Holstein
Germany
Bantry
Munster
Ireland
Ōita-shi
Oita
Japan
Yerseke
Zeeland
Netherlands
Träslövsläge- Varberg
Halland
Sweden
Berwick-Upon-Tweed- Birchington-on-Sea
- Borough Green
- Deal
- Dover
- Dovercourt
- Gravesend
- Harwich
- Hugh Town
- Ilfracombe
- Isles of Scilly
- North Shields
- Penzance
- Rayne
- Rochester
- Salcombe
- Sidmouth
- Strood
- Swanage
- Tilbury
- Tynemouth
- Wembury
- West Mersea
- Westgate on Sea
- Weymouth
- Whitburn
- Whitley Bay
- Woolwich
England
United Kingdom
Bridgeport
Connecticut- Edgartown
- Marblehead
- Nahant
- Nantucket
- Vineyard Haven
Massachusetts- New Castle
New Hampshire- Friday Harbor
Washington
United States