1. Species Polysiphonia devoniensis Maggs & Hommersand, 1993
2. Species Polysiphonia macrocarpa (C.Agardh) Sprengel, 1827
3. Species Polysiphonia opaca (C.Agardh) Moris & De Notaris, 1839
4. Species Polysiphonia orthocarpa Rosenvinge, 1924
5. Species Polysiphonia polyspora (C.Agardh) Montagne, 1840
6. Species Polysiphonia rhunensis Thuret, 1878
7. Species Polysiphonia sanguinea (C.Agardh) Zanardini, 1840
8. Species Polysiphonia stricta (Mertens ex Dillwyn) Greville, 1824
9. Species Polysiphonia subtilissima Montagne, 1840
10. Species Polysiphonia atlantica Kapraun & J.N.Norris, 1982 accepted as Bryocladia atlantica Kapraun & J.N.Norris) Díaz-Tapia 2023 ('2024')
11. Species Polysiphonia brodiei (Dillwyn) Sprengel, 1827 accepted as Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders, 2019
12. Species Polysiphonia ceramiiformis P.Crouan & H.Crouan, 1867 accepted as Vertebrata simulans (Harvey) Kuntze, 1891
13. Species Polysiphonia denudata (Dillwyn) Greville ex Harvey, 1833 accepted as Carradoriella denudata (Dillwyn) Savoie & G.W.Saunders, 2019
14. Species Polysiphonia elongata (Hudson) Sprengel, 1827 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019
15. Species Polysiphonia elongella Harvey, 1833 accepted as Carradoriella elongella (Harvey) Savoie & G.W.Saunders, 2019
16. Species Polysiphonia ferulacea Suhr ex J.Agardh, 1863 accepted as Melanothamnus ferulaceus (Suhr ex J.Agardh) Díaz-Tapia & Maggs, 2017 (synonym)
17. Species Polysiphonia fibrata (Dillwyn) Harvey, 1833 accepted as Leptosiphonia fibrata (C.Agardh) A.M.Savoie & G.W.Saunders, 2019
18. Species Polysiphonia fibrillosa (C.Agardh) Sprengel, 1827 accepted as Leptosiphonia fibrillosa (Agardh) Savoie & G.W.Saunders, 2019
19. Species Polysiphonia foetidissima Cocks ex Bornet, 1892 accepted as Vertebrata foetidissima (Cocks ex Bornet) Díaz-Tapia & Maggs, 2017 (synonym)
20. Species Polysiphonia fruticulosa (Wulfen) Sprengel, 1827 accepted as Vertebrata fruticulosa (Wulfen) Kuntze, 1891 (synonym)
21. Species Polysiphonia fucoides (Hudson) Greville, 1824 accepted as Vertebrata fucoides (Hudson) Kuntze, 1891 (synonym)
22. Species Polysiphonia furcellata (C.Agardh) Harvey, 1833 accepted as Vertebrata furcellata (C.Agardh) Kuntze, 1891 (synonym)
23. Species Polysiphonia harveyi Bailey, 1848 accepted as Melanothamnus harveyi (Bailey) Díaz-Tapia & Maggs, 2017
24. Species Polysiphonia insidiosa (J.Agardh) P.Crouan & H.Crouan, 1867 accepted as Neosiphonia harveyi (Bailey) M.-S.Kim, H.-G.Choi, Guiry & G.W.Saunders, 2001 accepted as Melanothamnus harveyi (Bailey) Díaz-Tapia & Maggs, 2017 (synonym)
25. Species Polysiphonia isogona Harvey, 1855 accepted as Vertebrata isogona (Harvey) Díaz-Tapia & Maggs, 2017
26. Species Polysiphonia japonica Harvey, 1857 accepted as Melanothamnus japonicus (Harvey) Díaz-Tapia & Maggs, 2017
27. Species Polysiphonia lanosa (Linnaeus) Tandy, 1931 accepted as Vertebrata lanosa (Linnaeus) T.A.Christensen, 1967
28. Species Polysiphonia nigra (Hudson) Batters, 1902 accepted as Vertebrata nigra (Hudson) Díaz-Tapia & Maggs, 2017 (synonym)
29. Species Polysiphonia nigrescens (Hudson) Greville ex Harvey, 1833 accepted as Vertebrata fucoides (Hudson) Kuntze, 1891 (synonym)
30. Species Polysiphonia richardsonii W.J.Hooker ex Harvey, 1833 accepted as Leptosiphonia fibrillosa (Agardh) Savoie & G.W.Saunders, 2019 (synonym)
31. Species Polysiphonia scopulorum Harvey, 1855 accepted as Bryocladia scopulorum (Harvey) Díaz-Tapia, 2023
32. Species Polysiphonia simpliciuscula P.Crouan & H.Crouan, 1852 accepted as Ophidocladus simpliciusculus (P.Crouan & H.Crouan) Falkenberg, 1897 (synonym)
33. Species Polysiphonia simulans Harvey, 1849 accepted as Vertebrata simulans (Harvey) Kuntze, 1891 (synonym)
34. Species Polysiphonia spinulosa Greville, 1823 accepted as Leptosiphonia fibrillosa (Agardh) Savoie & G.W.Saunders, 2019 (synonym)
35. Species Polysiphonia spiralis L.Batten, 1923 accepted as Polysiphonia stricta (Mertens ex Dillwyn) Greville, 1824 (synonym)
36. Species Polysiphonia subulifera (C.Agardh) Harvey, 1834 accepted as Vertebrata subulifera (C.Agardh) Kuntze, 1891
37. Species Polysiphonia violacea (Roth) Sprengel, 1827 accepted as Vertebrata fucoides (Hudson) Kuntze, 1891 (synonym)

marine, brackish, fresh

Hertwig, R. (1882). Die Actinien der Challenger Expedition. Gustav Fischer. Jena., pp. 119.
page(s): 55-56 [details] 

Guiry, M.D. & Guiry, G.M. (2026). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry). Polysiphonia Greville, 1823. Accessed through: The UK Marine Environmental Data and Information Network (2026) Marine Species of Britain, Ireland and Adjacent Seas (MSBIAS): a checklist of species derived from the UNICORN and Marine Recorder applications at: https://www.marinespecies.org/msbias/aphia.php?p=taxdetails&id=143853 on 2026-05-11

The UK Marine Environmental Data and Information Network (2026). Marine Species of Britain, Ireland and Adjacent Seas (MSBIAS): a checklist of species derived from the UNICORN and Marine Recorder applications. Polysiphonia Greville, 1823. Accessed at: https://www.marinespecies.org/Msbias/aphia.php?p=taxdetails&id=143853 on 2026-05-11

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