1. Genus Boryna Grateloup ex Bory de Saint-Vincent, 1822
2. Genus Calliclavula C.W.Schneider, 1989
3. Genus Callidictyon J.N.Norris & I.A.Abbott, 1995
4. Subfamily Ceramioideae De Toni, 1903
   1. Tribe Antithamnieae Hommersand, 1963
      1. Genus Acrothamnion J.Agardh, 1892
      2. Genus Antithamnion Nägeli, 1847
      3. Genus Hollenbergia Wollaston, 1972
      4. Genus Macrothamnion Wollaston, 1968
      5. Genus Perikladosporon Athanasiadis, 1996
      6. Genus Sporocanthus Kützing, 1855 accepted as Antithamnion Nägeli, 1847
      7. Genus Sporacanthus Kützing, 1855 (uncertain > nomen dubium)
   2. Tribe Bornetieae R.N. Baldock & H.B.S. Womersley, 1998
   3. Tribe Ceramieae (Dumortier) Schmitz, 1889
      1. Genus Ardreanema R.E.Norris & I.A.Abbott, 1992
      2. Genus Campylaephora J.Agardh, 1851
      3. Genus Carpoblepharis Kützing, 1843
      4. Genus Centroceras Kützing, 1842 '1841'
      5. Genus Centrocerocolax A.B.Joly, 1966
      6. Genus Ceramiopsis Boo & Lee, 1986
      7. Genus Ceramium Roth, 1797
      8. Genus Corallophila Weber-van Bosse, 1923
      9. Genus Gayliella T.O.Cho, L.J.McIvor & S.M.Boo, 2008
      10. Genus Herpochondria F.Schmitz & Falkenberg, 1897
      11. Genus Microcladia Greville, 1830
      12. Genus Pseudoceramium Barros-Barreto & Maggs, 2023
      13. Genus Reinboldiella De Toni, 1895
      14. Genus Sciurothamnion De Clerck & Kraft, 2002
      15. Genus Stirkia Barros-Barreto & Maggs, 2023
      16. Genus Syringocolax Reinsch, 1875
      17. Genus Yoneshiguea Barros-Barreto, Maggs & M.A.Jaramillo, 2023
      18. Genus Celeceras Kützing, 1849 accepted as Ceramium Roth, 1797
      19. Genus Ceramiella Børgesen, 1953 accepted as Corallophila Weber-van Bosse, 1923 (synonym)
      20. Genus Cyclospora J.Agardh, 1892 accepted as Carpoblepharis Kützing, 1843 (synonym)
      21. Genus Gloiothamnion T.Reinbold, 1895 accepted as Reinboldiella De Toni, 1895
      22. Genus Draparnaldiana (uncertain)
   4. Tribe Ceramioideae
   5. Tribe Dasyphileae Schmitz, 1889
      1. Genus Dasyphila Sonder, 1845
      2. Genus Muellerena F.Schmitz, 1897
      3. Genus Muellerella F.Schmitz ex Kylin, 1956 accepted as Muellerena F.Schmitz, 1897 (synonym)
   6. Tribe Dohrnielleae Feldmann-Mazoyer, 1941
      1. Genus Antithamnionella Lyle, 1922
      2. Genus Callithamniella Feldmann-Mazoyer, 1938
      3. Genus Dohrniella Funk, 1922
      4. Genus Haplocladium Nägeli, 1862 accepted as Antithamnionella Lyle, 1922
   7. Tribe Heterothamnieae Wollaston, 1968
      1. Genus Acrothamniopsis Athanasiadis & Kraft, 1996
      2. Genus Amoenothamnion Wollaston, 1968
      3. Genus Elisiella Womersley, 1998
      4. Genus Heterothamnion J.Agardh, 1892
      5. Genus Leptoklonion Athanasiadis, 1996
      6. Genus Tetrathamnion E.M.Wollaston, 1968
      7. Genus Trithamnion Wollaston, 1968
   8. Tribe Pterothamnieae A. Athanasiadis, 1996
      1. Genus Platythamnion J.Agardh, 1892
      2. Genus Pterothamnion Nägeli, 1855
      3. Genus Glandothamnus Wollaston, 1981 accepted as Pterothamnion Nägeli, 1855 (synonym)
   9. Tribe Scagelieae Athanasiadis, 1996
      1. Genus Scagelia E.M.Wollaston, 1972
   10. Tribe Scagelothamnieae Athanasiadis, 1969
       1. Genus Scagelothamnion Athanasiadis, 1996
5. Genus Ceramothamnion H.Richards, 1901
6. Genus Chaetoceras Kützing, 1847
7. Subfamily Compsothamnioideae De Toni
   1. Tribe Compsothamnieae Schmitz, 1889
      1. Genus Antarcticothamnion R.L.Moe & P.C.Silva, 1979
      2. Genus Compsothamnion (Nägeli) F.Schmitz, 1889
      3. Genus Dasythamniella P.C.Silva, 1970
      4. Genus Gymnophycus Huisman & Kraft, 1983
      5. Genus Mortensenia Weber Bosse, 1926
      6. Genus Rhododictyon W.R.Taylor, 1961
      7. Genus Scagelonema R.E.Norris & M.J.Wynne, 1969
      8. Genus Spencerella Darbishire, 1896
      9. Genus Rhodoplexia Harvey, 1844 accepted as Haloplegma Montagne, 1842 (synonym)
   2. Tribe Delesseriopsideae Itono & Tanaka, 1973
      1. Genus Balliella H.Itono & T.Tanaka, 1973
      2. Genus Delesseriopsis Okamura, 1931
   3. Tribe Halosieae M. Cormaci & G. Furnari, 1994
      1. Genus Halosia Cormaci & G.Furnari, 1994
   4. Tribe Lasiothalieae H.B.S. Womersley, 1998
      1. Genus Lasiothalia Harvey, 1855
   5. Tribe Radiathamnieae Gordon-Mills & Kraft, 1981
      1. Genus Laurenciophila Stegenga, 1986
      2. Genus Ochmapexus Womersley, 1998
      3. Genus Radiathamnion Gordon-Mills & Kraft, 1981
   6. Tribe Warrenieae Schmitz, 1889
      1. Genus Warrenia Harvey ex F.Schmitz & Hauptfleisch, 1897
8. Genus Gulsoniopsis Hommersand, 1963
9. Genus Irtugovia Perestenko, 1994
10. Tribe Liagorothamnieae Huisman, D.L.Ballantine & M.J.Wynne, 2000
11. Genus Ossiella A.J.K.Millar & I.A. Abbott, 1997
12. Genus Pandorella G. Feldmann, 1947
13. Genus Pterocladiopsis Ercegovic, 1963
14. Genus Seagriefia Stegenga, Bolton & Anderson, 1997
15. Tribe Skeletonelleae A.J.K.Millar & O.De Clerck, 2007
    1. Genus Skeletonella A.J.K.Millar & De Clerck, 2007
16. Subfamily Spongoclonioideae De Toni, 1903
    1. Tribe Spongoclonieae Schmitz, 1889
       1. Genus Lophothamnion J.Agardh, 1892
       2. Genus Pleonosporium Nägeli, 1862
       3. Genus Spongoclonium Sonder, 1853
       4. Genus Halothamnion J.Agardh, 1876 accepted as Pleonosporium Nägeli, 1862
       5. Genus Mesothamnion Børgesen, 1917 accepted as Pleonosporium Nägeli, 1862 (synonym)
17. Genus Trichoceras Kützing, 1849
18. Genus Zonariophila Stegenga & Kemperman, 1996
19. Genus Acanthoceras Kützing, 1842 accepted as Ceramium Roth, 1797
20. Genus Actinothamnion W.R.Taylor, 1929 accepted as Dohrniella Funk, 1922 (synonym)
21. Genus Anthithamnionella accepted as Antithamnionella Lyle, 1922 (misspelling)
22. Genus Bakothamnion Hoek, 1978 accepted as Balliella H.Itono & T.Tanaka, 1973 (synonym)
23. Genus Carpothamnium accepted as Carpothamnion Kützing, 1849 (misspelling)
24. Genus Ceratothamnion J.Agardh, 1892 accepted as Callithamnion Lyngbye, 1819
25. Genus Compsothamnionella Itono, 1977 accepted as Pleonosporium Nägeli, 1862 (synonym)
26. Genus Dasythamnion J.Agardh, 1894 accepted as Dasythamniella P.C.Silva, 1970 (synonym)
27. Genus Dictiderma Bonnemaison, 1822 accepted as Ceramium Roth, 1797
28. Genus Dorythamnion Nägeli, 1861 accepted as Callithamnion Lyngbye, 1819
29. Genus Echinoceras Kützing, 1841 accepted as Ceramium Roth, 1797 (synonym)
30. Genus Gaillonia F.Rudolphi, 1831 accepted as Ceramium Roth, 1797 (synonym)
31. Genus Gongroceras Kützing, 1841 accepted as Ceramium Roth, 1797 (synonym)
32. Genus Grateloupia Bonnemaison, 1822 accepted as Aglaothamnion Feldmann-Mazoyer, 1941
33. Genus Haploplegma accepted as Haloplegma Montagne, 1842 (misspelling)
34. Genus Herpoceras Cramer, 1863 accepted as Ceramium Roth, 1797 (synonym)
35. Genus Heterosphondylium Nägeli, 1862 accepted as Griffithsia C.Agardh, 1817 (synonym)
36. Genus Hormoceras Kützing, 1841 accepted as Ceramium Roth, 1797 (synonym)
37. Genus Leptothamnion Kützing, 1849 accepted as Callithamnion Lyngbye, 1819
38. Genus Pandorea J.Agardh, 1876 accepted as Griffithsia C.Agardh, 1817 (synonym)
39. Genus Phlebothamnion Kützing, 1843 accepted as Callithamnion Lyngbye, 1819 (synonym)
40. Genus Pteroceras Kützing, 1849 accepted as Ceramium Roth, 1797
41. Genus Stephanocomium Kützing, 1862 accepted as Anotrichium Nägeli, 1862
42. Genus Stepleya accepted as Shepleya E.M.Gordon, 1972 (misspelling)
43. Genus Thamnocarpus Harvey, 1844 accepted as Carpothamnion Kützing, 1849 (synonym)
44. Subfamily Ceramiaceae incertae sedis (temporary name)
    1. Genus Episporium Möbius, 1885
    2. Genus Perischelia J.Agardh ex Kylin, 1956
45. Genus Ascocladium Nägeli, 1861 (uncertain > nomen dubium)
46. Genus Episperma Rafinesque, 1814 (uncertain > nomen dubium)
47. Genus Herpothamnion Nägeli, 1862 (uncertain > nomen dubium)
48. Genus Microgelidiopsis Ercegovic, 1980 (uncertain > nomen dubium)
49. Genus Poecilothamnion Nägeli, 1847 (uncertain > nomen dubium)

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