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
   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 Ceramiella Børgesen, 1953 accepted as Corallophila Weber-van Bosse, 1923 (synonym)
      19. Genus Cyclospora J.Agardh, 1892 accepted as Carpoblepharis Kützing, 1843 (synonym)
      20. Genus Gloiothamnion T.Reinbold, 1895 accepted as Reinboldiella De Toni, 1895
      21. Genus Draparnaldiana (uncertain)
   4. 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)
   5. 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
   6. 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
   7. 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)
   8. Tribe Scagelieae Athanasiadis, 1996
      1. Genus Scagelia E.M.Wollaston, 1972
   9. 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 Irtugovia Perestenko, 1994
9. Tribe Liagorothamnieae Huisman, D.L.Ballantine & M.J.Wynne, 2000
10. Genus Ossiella A.J.K.Millar & I.A. Abbott, 1997
11. Genus Pandorella G. Feldmann, 1947
12. Genus Pterocladiopsis Ercegovic, 1963
13. Genus Seagriefia Stegenga, Bolton & Anderson, 1997
14. Tribe Skeletonelleae A.J.K.Millar & O.De Clerck, 2007
    1. Genus Skeletonella A.J.K.Millar & De Clerck, 2007
15. 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)
16. Genus Trichoceras Kützing, 1849
17. Genus Zonariophila Stegenga & Kemperman, 1996
18. Genus Actinothamnion W.R.Taylor, 1929 accepted as Dohrniella Funk, 1922 (synonym)
19. Genus Bakothamnion Hoek, 1978 accepted as Balliella H.Itono & T.Tanaka, 1973 (synonym)
20. Genus Compsothamnionella Itono, 1977 accepted as Pleonosporium Nägeli, 1862 (synonym)
21. Genus Dasythamnion J.Agardh, 1894 accepted as Dasythamniella P.C.Silva, 1970 (synonym)
22. Genus Echinoceras Kützing, 1841 accepted as Ceramium Roth, 1797 (synonym)
23. Genus Gaillonia F.Rudolphi, 1831 accepted as Ceramium Roth, 1797 (synonym)
24. Genus Gongroceras Kützing, 1841 accepted as Ceramium Roth, 1797 (synonym)
25. Genus Hormoceras Kützing, 1841 accepted as Ceramium Roth, 1797 (synonym)
26. Genus Pandorea J.Agardh, 1876 accepted as Griffithsia C.Agardh, 1817 (synonym)
27. Genus Phlebothamnion Kützing, 1843 accepted as Callithamnion Lyngbye, 1819 (synonym)
28. Genus Thamnocarpus Harvey, 1844 accepted as Carpothamnion Kützing, 1849 (synonym)
29. Subfamily Ceramiaceae incertae sedis (temporary name)
    1. Genus Episporium Möbius, 1885
    2. Genus Perischelia J.Agardh ex Kylin, 1956
30. Genus Ascocladium Nägeli, 1861 (uncertain > nomen dubium)
31. Genus Episperma Rafinesque, 1814 (uncertain > nomen dubium)
32. Genus Herpothamnion Nägeli, 1862 (uncertain > nomen dubium)
33. Genus Microgelidiopsis Ercegovic, 1980 (uncertain > nomen dubium)
34. Genus Poecilothamnion Nägeli, 1847 (uncertain > nomen dubium)

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