• Ceramium Gaertner ex Stackhouse, 1797 accepted as Palmaria Stackhouse, 1802
• Ceramium Roth, 1797
• Ceramium Wiggers, 1780 (uncertain)
• Ceramium abyssale Petersen, 1924
• Ceramium acanthonotum (Carmichael) J.Agardh, 1844 accepted as Ceramium shuttleworthianum (Kützing) Rabenhorst, 1847
• Ceramium acanthonotum f. coronatum (Kleen) Kjellman, 1880 accepted as Ceramium shuttleworthianum (Kützing) Rabenhorst, 1847
• Ceramium acanthonotum f. transcurrens Holmes & Batters (uncertain)
• Ceramium acanthonotum f. typica Kjellman (uncertain)
• Ceramium acanthonotum var. coronata Kleen (uncertain)
• Ceramium acanthonotum var. coronatum Kleen, 1874 accepted as Ceramium shuttleworthianum (Kützing) Rabenhorst, 1847
• Ceramium aciculare Roth, 1806 accepted as Chondracanthus acicularis (Roth) Fredericq, 1993
• Ceramium acrocarpum Kützing, 1863 accepted as Ceramium strictum var. acrocarpum (Kützing) Schiffner, 1943
• Ceramium acrocarpum Zanardini, 1854 (uncertain)
• Ceramium aculeatum C.Agardh ex Decaisne, 1841 accepted as Spyridia hypnoides (Bory de Saint-Vincent) Papenfuss, 1968
• Ceramium adauctum Schousboe (uncertain)
• Ceramium adhaerens Womersley, 2004
• Ceramium aduncum Nakamura, 1950
• Ceramium aegagropilum (Linnaeus) De Candolle, 1805 accepted as Cladophora aegagropila (Linnaeus) Trevisan, 1845 accepted as Aegagropila linnaei Kützing, 1843 accepted as Aegagropila brownii (Dillwyn) Kützing, 1854
• Ceramium aequabile J.Agardh, 1894 accepted as Ceramium tasmanicum (Kützing) Womersley, 1978
• Ceramium affine Setchell & N.L.Gardner, 1930
• Ceramium affine var. originale E.Y.Dawson, 1950
• Ceramium affine var. peninsulare E.Y.Dawson, 1950
• Ceramium agardhianum Griffiths ex Harvey, 1841 accepted as Ceramium deslongchampsii Chauvin ex Duby, 1830
• Ceramium albidum De Candolle, 1805
• Ceramium allochrous (Roth) Mertens (uncertain)
• Ceramium alternum Schousboe (uncertain)
• Ceramium amamiense Itono, 1972
• Ceramium annulatum Schousboe (uncertain)
• Ceramium apiculatum J.Agardh, 1876
• Ceramium appendiculatum Schousboe (uncertain)
• Ceramium arachnoideum (C.Agardh) J.Agardh, 1851 accepted as Ceramium tenuicorne (Kützing) Waern, 1952
• Ceramium arachnoideum var. patentissimum Harvey, 1853 (uncertain)
• Ceramium arborescens J.Agardh, 1894
• Ceramium arborescens f. boreale Petersen, 1926 accepted as Ceramium arborescens J.Agardh, 1894
• Ceramium arbuscula (Dillwyn) Bokry
• Ceramium arbuscula C.Agardh
• Ceramium arcticum J.Agardh, 1894
• Ceramium arenarium Simons, 1966
• Ceramium areschougii Kylin, 1907
• Ceramium armatum (Kützing) Grunow
• Ceramium armoricum P.S.Dixon & H.M.Parkes, 1968 accepted as Ceramium pallidum (Kützing) Maggs & Hommersand, 1993
• Ceramium asparagoides (Woodw.) Roth (uncertain)
• Ceramium aspergillosum J.V.Lamouroux, 1822 (uncertain)
• Ceramium asperum Roth, 1800
• Ceramium atlanticum H.E.Petersen, 1911
• Ceramium atlanticum f. norvegicum Petersen, 1925
• Ceramium atropurpureum
• Ceramium atropurpureum var. tenuissimum J.V.Lamouroux, 1822 (uncertain)
• Ceramium atrorubens Liljeblad, 1816 (uncertain)
• Ceramium atrorubescens Kylin, 1938
• Ceramium atrum Schousboe (uncertain)
• Ceramium attenuatum Meneghini
• Ceramium attenuatum Ruchinger
• Ceramium attenuatum var. australe Harvey
• Ceramium aucklandicum Kützing, 1849
• Ceramium aureum (Linnaeus) Agardh (uncertain)
• Ceramium australe Sonder, 1845
• Ceramium avalonae E.Y.Dawson, 1949
• Ceramium axillare A.P.de Candolle
• Ceramium azoricum Meneghini accepted as Ceramium echionotum var. azoricum (Meneghini) Piccone, 1884
• Ceramium barbatum (J.E.Smith) Duby, 1833
• Ceramium barbatum Kützing, 1842 accepted as Ceramium rubrum var. barbatum Feldmann-Mazoyer, 1941
• Ceramium barbatum f. nanum Schiffner (uncertain)
• Ceramium barbatum f. typicum Schiffner (uncertain)
• Ceramium barbatum var. minus Schiffner (uncertain)
• Ceramium bertholdii Funk, 1922
• Ceramium biasolethianum (Kützing) Ardissone accepted as Ceramium circinatum (Kützing) J.Agardh, 1851
• Ceramium biasolettianum (Kützing) Rabenhorst, 1847 (uncertain)
• Ceramium bicorne Setchell & Gardner, 1924
• Ceramium bisporum D.L.Ballantine, 1990
• Ceramium boergeseni Petersen, 1911 accepted as Ceramium boergesenii H.E.Petersen, 1911
• Ceramium boergesenii H.E.Petersen, 1911
• Ceramium boreale Okamura accepted as Campylaephora crassa (Okamura) Nakamura, 1950
• Ceramium borneense Weber-van Bosse, 1923
• Ceramium borreri (J.E.Smith) C.Agardh (uncertain)
• Ceramium borreri var. firmius C.Agardh (uncertain)
• Ceramium botryocarpum A.W.Griffiths ex Harvey, 1848
• Ceramium boucheri (Bonnemaison) Duby
• Ceramium boucheri var. mucilaginosum P.L.Crouan & H.M.Crouan
• Ceramium boucheri var. tenuissimum P.L.Crouan & H.M.Crouan
• Ceramium boydenii E.S.Gepp, 1904
• Ceramium brachiatum Bonnemaison, 1822 accepted as Callithamnion tetragonum (Stackhouse) S.F.Gray, 1821
• Ceramium brachiatum C.Agardh, 1817 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
• Ceramium brachygonum Lyngbye, 1819 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019
• Ceramium brasiliense A.B.Joly, 1957
• Ceramium breviarticulatum Shperk (uncertain)
• Ceramium breviarticulatum var. pellucidum Shperk (uncertain)
• Ceramium brevizonatum H.E.Petersen, 1918
• Ceramium brevizonatum var. caraibicum H.E.Petersen & Børgesen, 1924
• Ceramium brodiei (Dillwyn) C.Agardh, 1811 accepted as Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders, 2019
• Ceramium bulbosum Stackhouse
• Ceramium byssoides (Goodenough & Woodward) C.Agardh, 1811 accepted as Brongniartella byssoides (Goodenough & Woodward) F.Schmitz, 1893 accepted as Vertebrata byssoides (Goodenough & Woodward) Kuntze, 1891
• Ceramium byssoideum Harvey, 1853 accepted as Gayliella mazoyerae T.O.Cho, Fredericq & Hommersand, 2008
• Ceramium caespitosum Roth, 1797
• Ceramium caespitosum var. maximum Roth
• Ceramium californicum J.Agardh, 1894
• Ceramium californicum var. decipiens J.Agardh
• Ceramium callipterum Mazoyer, 1938
• Ceramium callithamnium Rafinesque (uncertain)
• Ceramium calyculatum Schousboe (uncertain)