1. Species Ceramium abyssale Petersen, 1924
2. Species Ceramium adhaerens Womersley, 2004
3. Species Ceramium aduncum Nakamura, 1950
4. Species Ceramium affine Setchell & N.L.Gardner, 1930
5. Species Ceramium albidum De Candolle, 1805
6. Species Ceramium amamiense Itono, 1972
7. Species Ceramium apiculatum J.Agardh, 1876
8. Species Ceramium arborescens J.Agardh, 1894
9. Species Ceramium arbuscula (Dillwyn) Bokry
10. Species Ceramium arbuscula C.Agardh
11. Species Ceramium arcticum J.Agardh, 1894
12. Species Ceramium arenarium Simons, 1966
13. Species Ceramium areschougii Kylin, 1907
14. Species Ceramium armatum (Kützing) Grunow
15. Species Ceramium asperum Roth, 1800
16. Species Ceramium atlanticum H.E.Petersen, 1911
17. Species Ceramium atropurpureum
18. Species Ceramium atrorubescens Kylin, 1938
19. Species Ceramium attenuatum Meneghini
20. Species Ceramium attenuatum Ruchinger
21. Species Ceramium aucklandicum Kützing, 1849
22. Species Ceramium australe Sonder, 1845
23. Species Ceramium avalonae E.Y.Dawson, 1949
24. Species Ceramium axillare A.P.de Candolle
25. Species Ceramium barbatum (J.E.Smith) Duby, 1833
26. Species Ceramium bertholdii Funk, 1922
27. Species Ceramium bicorne Setchell & Gardner, 1924
28. Species Ceramium bisporum D.L.Ballantine, 1990
29. Species Ceramium boergesenii H.E.Petersen, 1911
30. Species Ceramium borneense Weber-van Bosse, 1923
31. Species Ceramium botryocarpum A.W.Griffiths ex Harvey, 1848
32. Species Ceramium boucheri (Bonnemaison) Duby
33. Species Ceramium boydenii E.S.Gepp, 1904
34. Species Ceramium brasiliense A.B.Joly, 1957
35. Species Ceramium brevizonatum H.E.Petersen, 1918
36. Species Ceramium bulbosum Stackhouse
37. Species Ceramium caespitosum Roth, 1797
38. Species Ceramium californicum J.Agardh, 1894
39. Species Ceramium callipterum Mazoyer, 1938
40. Species Ceramium camouii E.Y.Dawson, 1944
41. Species Ceramium cancellatum (Linnaeus) De Candolle, 1805
42. Species Ceramium capense Kützing, 1841
43. Species Ceramium capitellatum De Notaris
44. Species Ceramium capricornu (Reinsch) Farlow
45. Species Ceramium casuarinae De Candolle
46. Species Ceramium catenatum (Linnaeus) De Candolle, 1805
47. Species Ceramium catenula (Kützing) Ardissone
48. Species Ceramium caudatum Setchell & N.L.Gardner, 1924
49. Species Ceramium centroceratiforme Simons, 1966
50. Species Ceramium chatamense G.Feldmann
51. Species Ceramium chathamense G.Feldmann, 1950
52. Species Ceramium ciliatum (J.Ellis) Ducluzeau, 1806
53. Species Ceramium cimbricum H.E.Petersen, 1924
54. Species Ceramium cingulatum Weber Bosse, 1923
55. Species Ceramium cingulum Meneses, 1995
56. Species Ceramium circinatum (Kützing) J.Agardh, 1851
57. Species Ceramium clarionense Setchell & N.L.Gardner, 1930
58. Species Ceramium clavaeforme Poiret
59. Species Ceramium clavutatum
60. Species Ceramium cliftonianum J.Agardh, 1876
61. Species Ceramium coccineum Draparnaud
62. Species Ceramium coccineum Roth ex Link, 1806
63. Species Ceramium congestum Bonnemaison
64. Species Ceramium contortum
65. Species Ceramium corallinum Delle Chiaje, 1829
66. Species Ceramium corallinum Bory, 1823
67. Species Ceramium cormacii Serio, Catra, Collodoro & Nisi, 2011
68. Species Ceramium corniculatum Montagne, 1861
69. Species Ceramium cornutum P.J.L.Dangeard, 1953
70. Species Ceramium corymbosum (E.B.) C.Agardh
71. Species Ceramium corymbosum J.Agardh
72. Species Ceramium crouanianum J.Agardh, 1894
73. Species Ceramium cruciatum Collins & Hervey, 1917
74. Species Ceramium cupulatum Womersley, 1978
75. Species Ceramium danicum Petersen, 1924
76. Species Ceramium dawsonii A.B.Joly, 1957
77. Species Ceramium derbesii Solier ex Kützing, 1847
78. Species Ceramium deslongchampsii Chauvin ex Duby, 1830
79. Species Ceramium diaphanum (Lightfoot) Roth, 1806
80. Species Ceramium didymum Bonnemaison
81. Species Ceramium dillwynii (Weber & Mohr) Roth
82. Species Ceramium discorticatum Heydrich, 1893
83. Species Ceramium divergens J.Agardh, 1894
84. Species Ceramium dorsiventrale Hommersand, 1963
85. Species Ceramium dozei Hariot, 1887
86. Species Ceramium ducluzeaui Bonnemaison
87. Species Ceramium echionotum J.Agardh, 1844
88. Species Ceramium equisetoides E.Y.Dawson, 1944
89. Species Ceramium evermannii Setchell & N.L.Gardner, 1930
90. Species Ceramium excellens J.Agardh, 1894
91. Species Ceramium fastigiatum Roussel, 1806
92. Species Ceramium fibrillosum (Dillwyn) Mertens
93. Species Ceramium fibrosum Roth, 1800
94. Species Ceramium flagellare (Esper) Ruchinger
95. Species Ceramium flagelliferum Kützing
96. Species Ceramium flastigiramosum
97. Species Ceramium floridanum J.Agardh, 1894
98. Species Ceramium forcipatum A.P.de Candolle, 1805
99. Species Ceramium fosliei (Petersen) Petersen, 1935
100. Species Ceramium fractum
101. Species Ceramium fruiticulosum Roth, 1981
102. Species Ceramium fruticulosum Roth, 1800
103. Species Ceramium fucoides (Hudson) De Candolle
104. Species Ceramium fujiianum M.B.Barros-Barreto & C.A.Maggs, 2006
105. Species Ceramium furcatum (Petersen) Petersen, 1925
106. Species Ceramium gaditanum (Clemente) Cremades, 1990
107. Species Ceramium giacconei Cormaci & G.Furnari, 1991
108. Species Ceramium gigartinum (Linnaeus) Roth
109. Species Ceramium glanduliferum Kylin, 1938
110. Species Ceramium glandulosum (Solander ex Turner) Barros-Barreto & Maggs, 2023
111. Species Ceramium gracilliferum Griffiths & Harvey
112. Species Ceramium gracillimum C.Agardh, 1824
113. Species Ceramium graecum Lazaridou & Boudouresque, 1992
114. Species Ceramium granulosum (E.B.) C.Agardh
115. Species Ceramium guttatum Bonnemaison, 1828
116. Species Ceramium hamatispinum E.Y.Dawson, 1950
117. Species Ceramium hellenicum Giaccone, 1968
118. Species Ceramium helminthochortos (Schwendimann) Roth, 1800
119. Species Ceramium heterospinum B.Subramanian, 1985
120. Species Ceramium hirsutum Roth, 1800
121. Species Ceramium hoodii W.R.Taylor, 1945
122. Species Ceramium hookeri (Dillwyn) C.Agardh
123. Species Ceramium horridum Meneghini, 1844
124. Species Ceramium howellii Setchell & N.L.Gardner, 1937
125. Species Ceramium hyalinum Rabenhorst
126. Species Ceramium incospicuum Zanardini, 1840
127. Species Ceramium inflexum Roth
128. Species Ceramium involutum Kützing, 1849
129. Species Ceramium irregulare Kützing, 1849
130. Species Ceramium isogonum Harvey, 1855
131. Species Ceramium johnstonii Setchell & Gardner, 1924
132. Species Ceramium jolyi (Díaz-Piferrer) D.L.Ballantine & M.J.Wynne, 1968
133. Species Ceramium juliae A.J.K.Millar, 2002
134. Species Ceramium koreanum Boo & I.K.Lee, 1986
135. Species Ceramium koronense Trono, 1972
136. Species Ceramium krameri G.R.South & Skelton, 2000
137. Species Ceramium kuetzingianum
138. Species Ceramium laingii Reinbold ex Laing, 1905
139. Species Ceramium lanciferum Kützing, 1847
140. Species Ceramium ledermannii Pilger, 1911
141. Species Ceramium lenormandii Montague
142. Species Ceramium lenticulare Womersley, 1978
143. Species Ceramium lentiforme A.J.K.Millar, 1990
144. Species Ceramium leptophloeum Kützing
145. Species Ceramium leptosiphon Pilger, 1920
146. Species Ceramium leptozonum M.A.Howe, 1918
147. Species Ceramium lessonii Kützing, 1849
148. Species Ceramium leutzelburgii Schmidt, 1924
149. Species Ceramium linum (Roth) De Candolle
150. Species Ceramium loureiri C.Agardh, 1824
151. Species Ceramium loureiroi C.Agardh
152. Species Ceramium luetzelburgii O.C.Schmidt, 1924
153. Species Ceramium lumbricale (Roth) Lamouroux
154. Species Ceramium macilentum J.Agardh, 1894
155. Species Ceramium macrotrichum Feldmann-Mazoyer, 1952
156. Species Ceramium manorense P.Anand, 1943
157. Species Ceramium marshallense E.Y.Dawson, 1957
158. Species Ceramium maryae Weber-van Bosse, 1923
159. Species Ceramium mauritianum Feldmann-Mazoyer, 1952
160. Species Ceramium mertensii (Turner) De Candolle
161. Species Ceramium mertensii (Turner) Roth
162. Species Ceramium metcalfii C.K.Tseng
163. Species Ceramium molle Roth
164. Species Ceramium monacanthum J.Agardh, 1894
165. Species Ceramium multicapsulare (Dillwyn) C.Agardh
166. Species Ceramium multijugum Jaasund, 1970
167. Species Ceramium nakamurae E.Y.Dawson, 1954
168. Species Ceramium nanum Kuehne, 1946
169. Species Ceramium nayalii Nasr, 1941
170. Species Ceramium nitens (C.Agardh) J.Agardh, 1851
171. Species Ceramium nodosum (Kützing) A.W.Griffiths & Harvey, 1847
172. Species Ceramium nodulosum Ducluzeau, 1850
173. Species Ceramium nodulosum De Candolle
174. Species Ceramium nudiusculum (Kützing) Rabenhorst, 1847
175. Species Ceramium obesum E.Y.Dawson, 1950
176. Species Ceramium ornatum Setchell & Gardner, 1930
177. Species Ceramium pallens Zanardini
178. Species Ceramium pallidum (Kützing) Maggs & Hommersand, 1993
179. Species Ceramium papenfussianum Simons, 1966
180. Species Ceramium pedicellatum (Duby) J.Agardh
181. Species Ceramium pedicellatum C.Agardh, 1817
182. Species Ceramium penicillatum Areschoug, 1849
183. Species Ceramium periconicum T.O.Cho & Riosmena-Rodríguez, 2008
184. Species Ceramium personatum Setchell & N.L.Gardner, 1930
185. Species Ceramium phillipsiae Huisman, 2018
186. Species Ceramium pilosum (Roth) Naccari
187. Species Ceramium pinastroides (Gmelin) Stackhouse
188. Species Ceramium plicatum Meneghini
189. Species Ceramium plocamium (S.G.Gmelin) Roth, 1800
190. Species Ceramium poeppigianum Grunow, 1868
191. Species Ceramium polyceras (Kützing) Zanardini, 1847
192. Species Ceramium polyspermum P.L.Crouan & H.M.Crouan
193. Species Ceramium polyspermum Shperk
194. Species Ceramium procumbens Setchell & N.L.Gardner, 1924
195. Species Ceramium prorepens Grunow
196. Species Ceramium prostratum E.Y.Dawson, 1963
197. Species Ceramium puberulum Sonder, 1845
198. Species Ceramium pulvereum (Dillwyn) C.Agardh
199. Species Ceramium punctiforme Setchell, 1924
200. Species Ceramium purpurascens Wallroth
201. Species Ceramium purum Roth, 1800
202. Species Ceramium pyridioides G.Feldmann
203. Species Ceramium reptans T.O.Cho & Fredericq, 2006
204. Species Ceramium rescissum Kylin, 1907
205. Species Ceramium rhizophorum (Montagne) De Toni
206. Species Ceramium rintelsianum G.R.South & Skelton, 2000
207. Species Ceramium riosmenae B.Y.Won & T.O.Cho, 2011
208. Species Ceramium rosenvingei Petersen, 1908
209. Species Ceramium rosenvingii H.E.Petersen
210. Species Ceramium rothianum M.A.Wolf, K.Sciuto, I. Moro, Maggs & Sfriso, 2019
211. Species Ceramium saviniae Feldmann-Mazoyer, 1952
212. Species Ceramium scandinavicum Petersen, 1924
213. Species Ceramium secundatum Lyngbye, 1819
214. Species Ceramium septentrionale Petersen, 1911
215. Species Ceramium serpens Setchell & N.L.Gardner, 1924
216. Species Ceramium setchellii A.H.S.Lucas, 1935
217. Species Ceramium shepherdii Womersley, 1978
218. Species Ceramium shuttleworthianum (Kützing) Rabenhorst, 1847
219. Species Ceramium siliquosum (Kützing) Maggs & Hommersand, 1993
220. Species Ceramium skottsbergii H.Petersen, 1924
221. Species Ceramium spinosopilosum Kützing, 1863
222. Species Ceramium spinosum (Linnaeus) Ruchinger
223. Species Ceramium spinulosum Biasoletto
224. Species Ceramium spyridioides G.Feldmann, 1950
225. Species Ceramium squamosum Rafinesque
226. Species Ceramium squarrosum (Harvey) J.Agardh
227. Species Ceramium stichidiosum J.Agardh, 1876
228. Species Ceramium strobiliforme G.W.Lawson & D.M.John, 1982
229. Species Ceramium subfuscum (Woodward) Stackhouse
230. Species Ceramium subtile J.Agardh, 1851
231. Species Ceramium subverticillatum (Grunow) Weber-van Bosse, 1923
232. Species Ceramium suhrianum P.C.Silva, 1996
233. Species Ceramium sungminbooi J.R.Hughey & G.H.Boo, 2016
234. Species Ceramium syntrophum (Kützing) Ardissone
235. Species Ceramium tasmanicum (Kützing) Womersley, 1978
236. Species Ceramium templetonii Setchell & N.L.Gardner, 1937
237. Species Ceramium tenue (J.Agardh) J.Agardh, 1894
238. Species Ceramium tenuicorne (Kützing) Waern, 1952
239. Species Ceramium tenuicorticatum Konno, 1974
240. Species Ceramium tenuissimum J.Agardh
241. Species Ceramium tetricum
242. Species Ceramium tranquillum Meneses in Abbott, 1998
243. Species Ceramium transcurrens (Kützing) Ardissone
244. Species Ceramium truncatum H.Petersen, 1936
245. Species Ceramium tubulosum Roth, 1800
246. Species Ceramium uncinatum Harvey, 1855
247. Species Ceramium ungulatum (Kützing) Hariot, 1889
248. Species Ceramium uniforme (Esper) Ruchinger
249. Species Ceramium uniforme Meneghini
250. Species Ceramium upolense G.R.South & Skelton, 2000
251. Species Ceramium uruguayense W.R.Taylor, 1960
252. Species Ceramium variegatum (Kützing) Okamura, 1932
253. Species Ceramium vatovai Schiffner, 1938
254. Species Ceramium venetum Zanardini
255. Species Ceramium verrucosum Roth
256. Species Ceramium vestitum Harvey, 1855
257. Species Ceramium vietnamense Pham-Hoàng Hô, 1969
258. Species Ceramium villosum (Hudson) Poiret
259. Species Ceramium virgatum Roth, 1797
260. Species Ceramium viride Filarszky
261. Species Ceramium viscainoense E.Y.Dawson, 1950
262. Species Ceramium wilsonii Womersley, 2004
263. Species Ceramium womersleyi R.E.Norris & I.A.Abbott, 1992
264. Species Ceramium wulfenii Roth
265. Species Ceramium zacae Setchell & N.L.Gardner, 1937
266. Species Ceramium acanthonotum (Carmichael) J.Agardh, 1844 accepted as Ceramium shuttleworthianum (Kützing) Rabenhorst, 1847
267. Species Ceramium aciculare Roth, 1806 accepted as Chondracanthus acicularis (Roth) Fredericq, 1993
268. Species Ceramium acrocarpum Kützing, 1863 accepted as Ceramium strictum var. acrocarpum (Kützing) Schiffner, 1943
269. Species Ceramium aculeatum C.Agardh ex Decaisne, 1841 accepted as Spyridia hypnoides (Bory de Saint-Vincent) Papenfuss, 1968
270. Species 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
271. Species Ceramium aequabile J.Agardh, 1894 accepted as Ceramium tasmanicum (Kützing) Womersley, 1978 (synonym)
272. Species Ceramium agardhianum Griffiths ex Harvey, 1841 accepted as Ceramium deslongchampsii Chauvin ex Duby, 1830
273. Species Ceramium arachnoideum (C.Agardh) J.Agardh, 1851 accepted as Ceramium tenuicorne (Kützing) Waern, 1952
274. Species Ceramium armoricum P.S.Dixon & H.M.Parkes, 1968 accepted as Ceramium pallidum (Kützing) Maggs & Hommersand, 1993
275. Species Ceramium azoricum Meneghini accepted as Ceramium echionotum var. azoricum (Meneghini) Piccone, 1884 (synonym)
276. Species Ceramium barbatum Kützing, 1842 accepted as Ceramium rubrum var. barbatum Feldmann-Mazoyer, 1941 (synonym)
277. Species Ceramium biasolethianum (Kützing) Ardissone accepted as Ceramium circinatum (Kützing) J.Agardh, 1851
278. Species Ceramium boergeseni Petersen, 1911 accepted as Ceramium boergesenii H.E.Petersen, 1911
279. Species Ceramium boreale Okamura accepted as Campylaephora crassa (Okamura) Nakamura, 1950 (synonym)
280. Species Ceramium brachiatum Bonnemaison, 1822 accepted as Callithamnion tetragonum (Stackhouse) S.F.Gray, 1821
281. Species Ceramium brachiatum C.Agardh, 1817 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
282. Species Ceramium brachygonum Lyngbye, 1819 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019
283. Species Ceramium brodiei (Dillwyn) C.Agardh, 1811 accepted as Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders, 2019
284. Species Ceramium byssoides (Goodenough & Woodward) C.Agardh, 1811 accepted as Brongniartella byssoides (Goodenough & Woodward) F.Schmitz, 1893 accepted as Vertebrata byssoides (Goodenough & Woodward) Kuntze, 1891
285. Species Ceramium byssoideum Harvey, 1853 accepted as Gayliella mazoyerae T.O.Cho, Fredericq & Hommersand, 2008 (synonym)
286. Species Ceramium camptum Borgesen accepted as Ceramium comptum Børgesen, 1924 accepted as Yoneshiguea compta (Børgesen) Barros-Barreto, Maggs & M.A.Jaramillo, 2023 (misspelling)
287. Species Ceramium cancellatum C.Agardh, 1824 accepted as Ceramium planum Kützing, 1849 accepted as Pseudoceramium planum (Kützing) Barros-Barreto & Maggs, 2023
288. Species Ceramium capillare de Lamarck & De Candolle, 1805 accepted as Cladophora glomerata var. crassior (C.Agardh) C.Hoek, 1963 (synonym)
289. Species Ceramium ceramicola (Lyngbye) Hornemann, 1828 accepted as Erythrotrichia carnea (Dillwyn) J.Agardh, 1883
290. Species Ceramium ceratophyllum (Roth) Poiret, 1811 accepted as Cladostephus ceratophyllum (Roth) C.Agardh, 1817
291. Species Ceramium chilense (Kützing) P.L.Crouan & H.M.Crouan, 1878 accepted as Ceramium subtile J.Agardh, 1851
292. Species Ceramium cinnabarinum (Grateloup ex Bory de Saint-Vincent) Hauck, 1882 accepted as Corallophila cinnabarina (Grateloup ex Bory) R.E.Norris, 1993 (synonym)
293. Species Ceramium circinnatum accepted as Ceramium circinatum (Kützing) J.Agardh, 1851
294. Species Ceramium cirrosum (Roth) C.Agardh, 1811 accepted as Sphacelaria cirrosa (Roth) C.Agardh, 1824
295. Species Ceramium clarionse Set. & Gardd accepted as Ceramium clarionense Setchell & N.L.Gardner, 1930 (misspelling)
296. Species Ceramium clavulatum C.Agardh, 1822 accepted as Centroceras clavulatum (C.Agardh) Montagne, 1846 (synonym)
297. Species Ceramium coccineum Zanardini, 1843 accepted as Ceramothamnion inconspicuum (Zanardini) M.J.Wynne & C.W.Schneider, 2023
298. Species Ceramium codicola J.Agardh, 1894 accepted as Ceramothamnion codicola (J.Agardh) M.J.Wynne & C.W.Schneider, 2023
299. Species Ceramium codii (H.Richards) Mazoyer, 1938 accepted as Stirkia codii (H.Richards) Barros-Barreto & Maggs, 2023
300. Species Ceramium codiophilum Setchell & N.L.Gardner, 1937 accepted as Ceramothamnion codicola (J.Agardh) M.J.Wynne & C.W.Schneider, 2023 (synonym)
301. Species Ceramium compactum Roth, 1806 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
302. Species Ceramium comptum Børgesen, 1924 accepted as Yoneshiguea compta (Børgesen) Barros-Barreto, Maggs & M.A.Jaramillo, 2023
303. Species Ceramium confervoides Roth, 1797 accepted as Ectocarpus siliculosus (Dillwyn) Lyngbye, 1819
304. Species Ceramium confervoides F.H.Wiggers, 1780 accepted as Gracilariopsis longissima (S.G.Gmelin) Steentoft, L.M.Irvine & Farnham, 1995 (synonym)
305. Species Ceramium confluens (Kützing) Ardissone, 1867 accepted as Ceramium circinatum (Kützing) J.Agardh, 1851
306. Species Ceramium cornigerum P.L.Crouan & H.M.Crouan, 1878 accepted as Ceramium subtile J.Agardh, 1851
307. Species Ceramium corticatulum Kylin, 1907 accepted as Ceramium tenuicorne (Kützing) Waern, 1952
308. Species Ceramium crassum Okamura, 1930 accepted as Campylaephora crassa (Okamura) Nakamura, 1950
309. Species Ceramium crispum Ducluzeau, 1806 accepted as Pterothamnion crispum (Ducluzeau) Nägeli, 1862
310. Species Ceramium cristatum Meneghini, 1844 accepted as Ceramium ciliatum (J.Ellis) Ducluzeau, 1806
311. Species Ceramium cryptacanthum (Kützing) Sonder, 1848 accepted as Centroceras clavulatum (C.Agardh) Montagne, 1846
312. Species Ceramium cymosum Okamura accepted as Campylaephora crassa (Okamura) Nakamura, 1950 (synonym)
313. Species Ceramium dalmaticum Meneghini, 1844 accepted as Ceramium echionotum J.Agardh, 1844
314. Species Ceramium daviesii (Dillwyn) C.Agardh, 1817 accepted as Colaconema daviesii (Dillwyn) Stegenga, 1985
315. Species Ceramium decurrens (Kützing) Kützing ex Harvey, 1849 accepted as Ceramium circinatum (Kützing) J.Agardh, 1851
316. Species Ceramium densum Roth, 1800 accepted as Cladophora vagabunda (Linnaeus) Hoek, 1963
317. Species Ceramium diaphanoides Kützing, 1863 accepted as Ceramium virgatum Roth, 1797
318. Species Ceramium dichotomum (Linnaeus) Roth, 1797 accepted as Vaucheria dichotoma (Linnaeus) Martius, 1817
319. Species Ceramium digenea Chiaje, 1829 accepted as Digenea simplex (Wulfen) C.Agardh, 1822 (synonym)
320. Species Ceramium digitatum (Hudson) Stackhouse, 1797 accepted as Laminaria digitata (Hudson) J.V.Lamouroux, 1813
321. Species Ceramium divaricatum P.L.Crouan & H.M.Crouan ex J.Agardh, 1852 accepted as Ceramium tenuissimum f. divaricatum (P.L.Crouan & H.M.Crouan ex J.Agardh) Foslie, 1893 (synonym)
322. Species Ceramium dudresnayi Bonnemaison, 1828 accepted as Gaillona seposita (Gunnerus) Athanasiadis, 2016
323. Species Ceramium dumosertum R.E.Norris & Abbott, 1992 accepted as Ceramothamnion dumosertum (R.E.Norris & I.A.Abbott) M.J.Wynne & C.W.Schneider, 2023
324. Species Ceramium eatonianum (Farlow) De Toni, 1903 accepted as Corallophila eatoniana (Farlow) T.O.Cho, H.-G.Choi, G.I.Hansen & S.M.Boo, 2000
325. Species Ceramium echinophorum Meneghini, 1844 accepted as Ceramium echionotum J.Agardh, 1844
326. Species Ceramium edule Stackhouse, 1797 accepted as Dilsea carnosa (Schmidel) Kuntze, 1898
327. Species Ceramium elegans (Roth) Ducluzeau, 1805 accepted as Ceramium siliquosum var. elegans (Roth) G.Furnari, 1999
328. Species Ceramium elongatum (Hudson) Roth, 1800 accepted as Carradoriella elongata (Hudson) Savoie & G.W.Saunders, 2019
329. Species Ceramium equisetoides Nakamura, 1950 accepted as Ceramium nakamurae E.Y.Dawson, 1954
330. Species Ceramium erumpens Meneghini, 1844 accepted as Ceramium diaphanum (Lightfoot) Roth, 1806
331. Species Ceramium esculentum (Linnaeus) Stackhouse, 1797 accepted as Alaria esculenta (Linnaeus) Greville, 1830
332. Species Ceramium fastigiatum Harvey, 1834 accepted as Ceramium cimbricum H.E.Petersen, 1924 (synonym)
333. Species Ceramium fastigiatum Roth, 1800 accepted as Vertebrata lanosa (Linnaeus) T.A.Christensen, 1967
334. Species Ceramium fastigiramosum S.M.Boo & I.K.Lee, 1985 accepted as Ceramium cimbricum H.E.Petersen, 1924
335. Species Ceramium ferrugineum (Roth) C.Agardh, 1811 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
336. Species Ceramium filamentosum (Wulfen) C.Agardh, 1828 accepted as Spyridia filamentosa (Wulfen) Harvey, 1833
337. Species Ceramium filicinum Grateloup, 1806 accepted as Halopteris filicina (Grateloup) Kützing, 1843
338. Species Ceramium filicula Harvey ex Womersley, 1978 accepted as Reinboldiella filicula (Harvey ex Womersley) Barros-Barreto & Maggs, 2023
339. Species Ceramium fimbriatum Setchell & N.L.Gardner, 1924 accepted as Gayliella fimbriata (Setchell & N.L.Gardner) T.O.Cho & S.M.Boo, 2008 (synonym)
340. Species Ceramium flabelliferum Kützing accepted as Ceramium virgatum Roth, 1797
341. Species Ceramium flabelligerum J.Agardh, 1844 accepted as Ceramium gaditanum (Clemente) Cremades, 1990 (synonym)
342. Species Ceramium flaccidum (Harvey ex Kützing) Ardissone, 1871 accepted as Gayliella flaccida (Harvey ex Kützing) T.O.Cho & L.J.McIvor, 2008 (synonym)
343. Species Ceramium flexuosum C.Agardh, 1824 accepted as Pleonosporium flexuosum (C.Agardh) Bornet, 1892
344. Species Ceramium floccosum (O.F.Müller) Roth, 1800 accepted as Antithamnionella floccosa (O.F.Müller) Whittick, 1980
345. Species Ceramium floribundum Kützing, 1863 accepted as Ceramium virgatum Roth, 1797
346. Species Ceramium floridulum (Dillwyn) C.Agardh, 1817 accepted as Rhodothamniella floridula (Dillwyn) Feldmann, 1978
347. Species Ceramium fragile Ardissone, 1879 accepted as Ceramium cimbricum H.E.Petersen, 1924
348. Species Ceramium fruticulosum (Kützing) J.Agardh, 1894 accepted as Ceramium penicillatum Areschoug, 1849 (synonym)
349. Species Ceramium fuscum (Hudson) Roth, 1800 accepted as Sphacelaria fusca (Hudson) S.F.Gray, 1821
350. Species Ceramium gaillonii P.L.Crouan & H.M.Crouan, 1839 accepted as Aglaothamnion gaillonii (P.L.Crouan & H.M.Crouan) Halos, 1965 (synonym)
351. Species Ceramium gardneri Kylin, 1941 accepted as Campylaephora gardneri (Kylin) Barros-Barreto & Maggs, 2023
352. Species Ceramium gasparrinii Meneghini, 1844 accepted as Centroceras gasparrinii (Meneghini) Kützing, 1849 (synonym)
353. Species Ceramium gibbosum Meneghini, 1844 accepted as Ceramium diaphanum (Lightfoot) Roth, 1806
354. Species Ceramium giganteum Meneghini, 1844 accepted as Ceramium ciliatum (J.Ellis) Ducluzeau, 1806
355. Species Ceramium gobii Waern, 1992 accepted as Ceramium tenuicorne (Kützing) Waern, 1952 (synonym)
356. Species Ceramium gracile De Candolle, 1805 accepted as Ceramium siliquosum var. elegans (Roth) G.Furnari, 1999
357. Species Ceramium gracillimum (Kützing) Zanardini, 1847 accepted as Ceramium diaphanum (Lightfoot) Roth, 1806 (synonym)
358. Species Ceramium gracillimum Gobi, 1877 accepted as Ceramium tenuicorne (Kützing) Waern, 1952
359. Species Ceramium gracillimum Griffiths & Harvey ex Harvey, 1848 accepted as Ceramium flaccidum (Harvey ex Kützing) Ardissone, 1871 accepted as Gayliella flaccida (Harvey ex Kützing) T.O.Cho & L.J.McIvor, 2008 (synonym)
360. Species Ceramium granulatum Ducluzeau, 1805 accepted as Callithamnion granulatum (Ducluzeau) C.Agardh, 1828 (synonym)
361. Species Ceramium griffitsianum (J.E.Smith) C.Agardh, 1817 accepted as Spyridia griffithsiana (J.E.Smith) Zuccarello, Prud'homme & H.Stegenga, 2004
362. Species Ceramium hamatum A.D.Cotton, 1906 accepted as Campylaephora hypnaeoides J.Agardh, 1851
363. Species Ceramium hanaense R.E.Norris & I.A.Abbott, 1992 accepted as Ceramium nakamurae E.Y.Dawson, 1954
364. Species Ceramium hooperi Harvey, 1853 accepted as Ceramium deslongchampsii var. hooperi (Harvey) W.R.Taylor, 1937 (synonym)
365. Species Ceramium horridulum P.C.Silva, 1972 (unaccepted)
366. Species Ceramium horridum Setchell & N.L.Gardner, 1924 (unaccepted, synonym)
367. Species Ceramium hospitans Zanardini, 1847 (unaccepted)
368. Species Ceramium howei Weber-van Bosse, 1923 (unaccepted)
369. Species Ceramium huysmansii Weber-van Bosse, 1923 (unaccepted)
370. Species Ceramium hyalacanthum (Kützing) Sonder, 1848 (unaccepted)
371. Species Ceramium hypnaeoides (J.Agardh) Okamura, 1927 (unaccepted)
372. Species Ceramium inconspicuum Zanardini, 1840 (unaccepted)
373. Species Ceramium incurvum (Hudson) De Candolle, 1805 (unaccepted, synonym)
374. Species Ceramium inkyui T.O.Cho, Fredericq & S.M.Boo, 2003 (unaccepted)
375. Species Ceramium interruptum Setchell & N.L.Gardner, 1924 (unaccepted)
376. Species Ceramium intricatum C.Agardh, 1824 (unaccepted, synonym)
377. Species Ceramium itonoi Ardré, 1987 (unaccepted)
378. Species Ceramium japonicum Okamura, 1896 (unaccepted)
379. Species Ceramium julaceum (Kützing) Rabenhorst, 1847 (unaccepted)
380. Species Ceramium kellneri Meneghini, 1844 (unaccepted)
381. Species Ceramium kondoi Yendo, 1920 (unaccepted)
382. Species Ceramium laetum Meneghini ex Ardissone, 1871 (unaccepted)
383. Species Ceramium lamourouxii Duby, 1830 (unaccepted)
384. Species Ceramium lanuginosum (Dillwyn) Agardh, 1824 (unaccepted)
385. Species Ceramium littorale (Linnaeus) Dillwyn, 1809 (unaccepted)
386. Species Ceramium longissimum (S.G.Gmelin) Roth, 1800 (unaccepted)
387. Species Ceramium macrocarpum Kützing, 1863 (unaccepted)
388. Species Ceramium macrogonium (Kützing) Ardissone, 1871 (unaccepted)
389. Species Ceramium masonii E.Y.Dawson, 1950 (unaccepted, synonym)
390. Species Ceramium mazatlanense E.Y.Dawson, 1950 (unaccepted, synonym)
391. Species Ceramium miniatum Suhr ex J.Agardh, 1851 (unaccepted)
392. Species Ceramium miniatum C.Agardh, 1824 (unaccepted)
393. Species Ceramium minutulum Noda & Konno, 1974 (unaccepted, synonym)
394. Species Ceramium monile J.D.Hooker & Harvey, 1847 (unaccepted, synonym)
395. Species Ceramium mucronatum Segi, 1944 (unaccepted)
396. Species Ceramium musciforme (Wulfen) Ruchinger, 1818 (unaccepted, synonym)
397. Species Ceramium nobile J.Agardh, 1894 (unaccepted)
398. Species Ceramium nodiferum (Kützing) Shperk, 1869 (unaccepted, synonym)
399. Species Ceramium nodulosum (Lightfoot) Ducluzeau, 1806 (unaccepted)
400. Species Ceramium nudiusculum (Kützing) Zanardini, 1847 (unaccepted)
401. Species Ceramium obsoletum C.Agardh, 1828 (unaccepted)
402. Species Ceramium ocellatum Grateloup, 1806 (unaccepted)
403. Species Ceramium ordinatum Kützing, 1943 (unaccepted)
404. Species Ceramium orsinianum Meneghini, 1844 (unaccepted)
405. Species Ceramium pacificum (Collins) Kylin, 1925 (unaccepted)
406. Species Ceramium palmatum (Linnaeus) Stackhouse, 1797 (unaccepted)
407. Species Ceramium paniculatum Okamura, 1921 (unaccepted)
408. Species Ceramium pappenfussianum Simons (unaccepted, misspelling)
409. Species Ceramium patens Meneghini, 1844 (unaccepted)
410. Species Ceramium patens Greville, 1828 (unaccepted)
411. Species Ceramium pedicellatum J.Agardh, 1894 (unaccepted)
412. Species Ceramium pedicellatum Hornemann, 1818 (unaccepted)
413. Species Ceramium pellucidum (Kützing) Rabenhorst, 1846 (unaccepted)
414. Species Ceramium pellucidum (Kützing) Bertoloni, 1862 (unaccepted)
415. Species Ceramium pennatum J.Agardh, 1851 (unaccepted)
416. Species Ceramium pennatum Hornemann, 1813 (unaccepted)
417. Species Ceramium pennatum Roth, 1806 (unaccepted)
418. Species Ceramium phyllitis (Stackhouse) Stackhouse, 1797 (unaccepted)
419. Species Ceramium planum Kützing, 1849 (unaccepted)
420. Species Ceramium plicatum (Hudson) Roth (unaccepted)
421. Species Ceramium plumosum (Hudson) Roth, 1806 (unaccepted)
422. Species Ceramium plumula (J.Ellis) C.Agardh, 1817 (unaccepted)
423. Species Ceramium polygonum (Kützing) Shperk, 1869 (unaccepted)
424. Species Ceramium polymorphum (Linnaeus) De Candolle, 1805 (unaccepted, synonym)
425. Species Ceramium ptilocladioides R.E.Norris & Abbott, 1992 (unaccepted)
426. Species Ceramium pulchellum Agardh, 1812 (unaccepted)
427. Species Ceramium pulvinatum Mertens, 1817 (unaccepted)
428. Species Ceramium pusillum Harvey, 1863 (unaccepted)
429. Species Ceramium pygmaeum (Kützing) Bertoloni, 1862 (unaccepted)
430. Species Ceramium radicans Ardissone, 1888 (unaccepted)
431. Species Ceramium radiculosum Grunow ex Hauck, 1875 (unaccepted)
432. Species Ceramium ramulosum Hooker & Harvey, 1847 (unaccepted, synonym)
433. Species Ceramium ramulosum Meneghini, 1844 (unaccepted)
434. Species Ceramium recissum Kylin (unaccepted)
435. Species Ceramium recticorticum E.Y.Dawson, 1950 (unaccepted)
436. Species Ceramium repens Harvey, 1863 (unaccepted)
437. Species Ceramium repens (Dillwyn) C.Agardh, 1817 (unaccepted)
438. Species Ceramium repens Zanardini, 1847 (unaccepted)
439. Species Ceramium rhizodes C.Agardh, 1811 (unaccepted)
440. Species Ceramium rigens Shousboe ex C.Agardh (unaccepted)
441. Species Ceramium rigidum Ardissone, 1864 (unaccepted)
442. Species Ceramium robustum Petersen, 1929 (unaccepted)
443. Species Ceramium robustum J.Agardh, 1894 (unaccepted, synonym)
444. Species Ceramium roseolum C.Agardh, 1824 (unaccepted)
445. Species Ceramium roseolum Crouan (unaccepted)
446. Species Ceramium roseum Roth, 1798 (unaccepted)
447. Species Ceramium rothii (Turton) W.J.Hooker, 1821 (unaccepted)
448. Species Ceramium rubriforme Kylin, 1907 (unaccepted)
449. Species Ceramium rubrum C.Agardh, 1811 (unaccepted)
450. Species Ceramium rupestre (Linnaeus) De Candolle, 1805 (unaccepted)
451. Species Ceramium scoparium (Linnaeus) De Candolle, 1805 (unaccepted, synonym)
452. Species Ceramium scopulorum C.Agardh, 1824 (unaccepted)
453. Species Ceramium scorpioides (Hudson) Roth, 1800 (unaccepted)
454. Species Ceramium secundatum (Lyngbye) C.Agardh, 1824 (unaccepted)
455. Species Ceramium sericeum de Lamarck & De Candolle, 1805 (unaccepted)
456. Species Ceramium seriosporum E.Y.Dawson, 1963 (unaccepted)
457. Species Ceramium sertularioides Grateloup, 1806 (unaccepted, synonym)
458. Species Ceramium setaceum (Hudson) Duby, 1830 (unaccepted)
459. Species Ceramium setaceum (Hudson) Wallroth, 1833 (unaccepted)
460. Species Ceramium setaceum (Wulfen) Ruchinger, 1818 (unaccepted)
461. Species Ceramium siliculosum (Dillwyn) C.Agardh, 1811 (unaccepted)
462. Species Ceramium simplex C.Agardh, 1824 (unaccepted)
463. Species Ceramium simplicifilum A.P.de Candolle, 1806 (unaccepted)
464. Species Ceramium sinicola Setchell & N.L.Gardner, 1924 (unaccepted)
465. Species Ceramium spiniferum Kützing, 1849 (unaccepted)
466. Species Ceramium spinoso-pilosum Kützing (unaccepted)
467. Species Ceramium spinulosum (Kützing) Rabenhorst, 1847 (unaccepted)
468. Species Ceramium spongiosum (Hudson) Wahlenberg, 1826 (unaccepted)
469. Species Ceramium strictoides P.L.Crouan & H.M.Crouan, 1878 (unaccepted)
470. Species Ceramium strictum (Kützing) Rabenhorst, 1847 (unaccepted, synonym)
471. Species Ceramium strictum (Mertens ex Dillwyn) Poiret, 1811 (unaccepted, synonym)
472. Species Ceramium subdichotomum Weber-van Bosse, 1923 (unaccepted, synonym)
473. Species Ceramium subulatum Ducluzeau, 1805 (unaccepted)
474. Species Ceramium subverticullatum (Grunow) Weber- van Bosse (unaccepted, misspelling)
475. Species Ceramium sympodiale E.Y.Dawson, 1957 (unaccepted)
476. Species Ceramium taylorii E.Y.Dawson, 1950 (unaccepted)
477. Species Ceramium teedei Mertens ex Roth, 1806 (unaccepted)
478. Species Ceramium tenerrimum (G.Martens) Okamura, 1921 (unaccepted)
479. Species Ceramium tenuissimum (Roth) Areschoug, 1847 (unaccepted, synonym)
480. Species Ceramium tenuissimum Bonnemaison, 1828 (unaccepted)
481. Species Ceramium tetragonum (Withering) C.Agardh, 1817 (unaccepted)
482. Species Ceramium thuioides (Smith) C.Agardh, 1824 (unaccepted)
483. Species Ceramium tomentosum (Hudson) Roth, 1800 (unaccepted)
484. Species Ceramium torulosum J.Agardh, 1876 (unaccepted, synonym)
485. Species Ceramium tranquebariense Roth, 1806 (unaccepted)
486. Species Ceramium transversale F.S.Collins & Hervey, 1917 (unaccepted)
487. Species Ceramium tuberculosum Roth, 1800 (unaccepted)
488. Species Ceramium tuberculosum Hornemann, 1816 (unaccepted)
489. Species Ceramium turneri Mertens ex Roth, 1806 (unaccepted)
490. Species Ceramium vagabundum (Linnaeus) Roth, 1800 (unaccepted)
491. Species Ceramium vagabundum E.Y.Dawson, 1957 (unaccepted)
492. Species Ceramium vagans P.C.Silva, 1987 (unaccepted)
493. Species Ceramium vendlicum Peterson, 1929 (unaccepted, synonym)
494. Species Ceramium verongiae D.L.Ballantine & M.J.Wynne, 1986 (unaccepted)
495. Species Ceramium versicolor C.Agardh, 1824 (unaccepted)
496. Species Ceramium verticillatum (Lightfoot) De Candolle, 1805 (unaccepted)
497. Species Ceramium verticillatum Ducluzeau, 1805 (unaccepted)
498. Species Ceramium villosum Kützing, 1849 (unaccepted)
499. Species Ceramium vimineum J.Agardh, 1894 (unaccepted)
500. Species Ceramium violaceum Roth, 1797 (unaccepted, synonym)
501. Species Ceramium washingtoniense Kylin, 1925 (unaccepted, synonym)
502. Species Ceramium wulfeni Roth, 1806 (unaccepted)
503. Species Ceramium zebrinum J.Agardh, 1894 (unaccepted, synonym)
504. Species Ceramium acrocarpum Zanardini, 1854 (uncertain)
505. Species Ceramium adauctum Schousboe (uncertain)
506. Species Ceramium allochrous (Roth) Mertens (uncertain)
507. Species Ceramium alternum Schousboe (uncertain)
508. Species Ceramium annulatum Schousboe (uncertain)
509. Species Ceramium appendiculatum Schousboe (uncertain)
510. Species Ceramium asparagoides (Woodw.) Roth (uncertain)
511. Species Ceramium aspergillosum J.V.Lamouroux, 1822 (uncertain)
512. Species Ceramium atrorubens Liljeblad, 1816 (uncertain)
513. Species Ceramium atrum Schousboe (uncertain)
514. Species Ceramium aureum (Linnaeus) Agardh (uncertain)
515. Species Ceramium biasolettianum (Kützing) Rabenhorst, 1847 (uncertain)
516. Species Ceramium borreri (J.E.Smith) C.Agardh (uncertain)
517. Species Ceramium breviarticulatum Shperk (uncertain)
518. Species Ceramium callithamnium Rafinesque (uncertain)
519. Species Ceramium calyculatum Schousboe (uncertain)
520. Species Ceramium capillaceum Meneghini (uncertain)
521. Species Ceramium chalybeum (Roth) C.Agardh (uncertain)
522. Species Ceramium cirrhosum (Wulf.) C.Agardh (uncertain)
523. Species Ceramium clavellosum (Turner) Roth (uncertain)
524. Species Ceramium clavigerum Bonnemaison (uncertain)
525. Species Ceramium clavigerum Bonnemaison ex Chauvin (uncertain)
526. Species Ceramium coccineum (Hudson) Bory (uncertain)
527. Species Ceramium coccineum (Ellis) De Candolle (uncertain)
528. Species Ceramium connivens Zanardini, 1847 (uncertain)
529. Species Ceramium dasytrichum Montagne (uncertain)
530. Species Ceramium daviesii (Dillwyn) Bonnemaison (uncertain)
531. Species Ceramium diffusum (Hudson) Stackhouse (uncertain)
532. Species Ceramium digeneae DeNotaris (uncertain)
533. Species Ceramium dumosum Mertens (uncertain)
534. Species Ceramium duriusculum (Kützing) Rabenhorst, 1846 (uncertain)
535. Species Ceramium equisetifolium (Lightf.) De Candolle (uncertain)
536. Species Ceramium felicii Gaillon (uncertain)
537. Species Ceramium flavicans Schousboe (uncertain)
538. Species Ceramium flavum Schousboe (uncertain)
539. Species Ceramium friabile Schousboe (uncertain)
540. Species Ceramium fructiculosum (Wulfen) Stackhouse (uncertain)
541. Species Ceramium furcellatum (Linnaeus) Wiggers (uncertain)
542. Species Ceramium furcellatum Kützing (uncertain)
543. Species Ceramium gelatinosum Schousboe (uncertain)
544. Species Ceramium glomeratum De Candolle (uncertain)
545. Species Ceramium grateloupii Bonnemaison (uncertain)
546. Species Ceramium grateloupii Duby (uncertain)
547. Species Ceramium gymnogonium Meneghini, 1844 (uncertain)
548. Species Ceramium hispidum Schousboe (uncertain)
549. Species Ceramium hystrix (Kützing) Frauenfeld, 1854 (uncertain)
550. Species Ceramium implexum Schousboe (uncertain)
551. Species Ceramium lamourouxii Bonnemaison (uncertain)
552. Species Ceramium laterale Schousboe (uncertain)
553. Species Ceramium leptacanthum (Kützing) Zanardini (uncertain)
554. Species Ceramium leptocladum Schiffner, 1933 (uncertain)
555. Species Ceramium lobatum (Kützing) Shperk (uncertain)
556. Species Ceramium lucidum Grateloup, 1806 (uncertain)
557. Species Ceramium microcarpon Schousboe (uncertain)
558. Species Ceramium morisianum Bertoloni, 1829 (uncertain, uncertain taxonomic status subjected to verification)
559. Species Ceramium myriophyllum Poiret, 1811 (uncertain)
560. Species Ceramium opacum Rafinesque (uncertain)
561. Species Ceramium oppositum Schousboe (uncertain)
562. Species Ceramium opuntia Schousboe (uncertain)
563. Species Ceramium orthocladum Schiffner, 1926 (uncertain)
564. Species Ceramium parvulum (Zanardini ex Frauenfeld) Grunow, 1867 (uncertain)
565. Species Ceramium pediculum Suhr (uncertain)
566. Species Ceramium pennatum (Hudson) Roth, 1800 (uncertain)
567. Species Ceramium pennatum P.Crouan & H.Crouan, 1852 (uncertain)
568. Species Ceramium petitii G.Feldmann, 1954 (uncertain)
569. Species Ceramium pictaviense Deltre (uncertain)
570. Species Ceramium piliferum Schousboe (uncertain)
571. Species Ceramium pinnulatum C. Agardh (uncertain)
572. Species Ceramium pleurosporum Schiffner, 1938 (uncertain)
573. Species Ceramium pluma (Dillwyn) C.Agardh (uncertain)
574. Species Ceramium pluvinatum Mertens (uncertain)
575. Species Ceramium proliferum (Lyngbye) H.E.Petersen (uncertain)
576. Species Ceramium proliferum Yates (uncertain)
577. Species Ceramium pseudostrictum Schiffner, 1938 (uncertain)
578. Species Ceramium pteroma Schousboe (uncertain)
579. Species Ceramium purpureum Delle Chiaje, 1829 (uncertain)
580. Species Ceramium pygmaeum Schiffner, 1931 (uncertain)
581. Species Ceramium pyramidatum Schousboe (uncertain)
582. Species Ceramium racemosum Schousboe (uncertain)
583. Species Ceramium rugosum J.V.Lamouroux, 1822 (uncertain)
584. Species Ceramium sandrianum Meneghini ex P.Titius, 1854 (uncertain)
585. Species Ceramium scoparium (Linnaeus) Roth (uncertain)
586. Species Ceramium setosum Schousboe (uncertain)
587. Species Ceramium spicatum Schousboe (uncertain)
588. Species Ceramium spinulosum Bertoloni, 1862 (uncertain)
589. Species Ceramium stenocladum Schiffner, 1933 (uncertain, uncertain taxonomic status subjected to verification)
590. Species Ceramium strictum Greville & Harvey, 1846 (uncertain)
591. Species Ceramium strictum Roth, 1806 (uncertain)
592. Species Ceramium subcartilagineum J.Agardh (uncertain)
593. Species Ceramium subsimplex Schousboe (uncertain)
594. Species Ceramium subvirgatum Zanardini, 1854 (uncertain)
595. Species Ceramium tenellum (Vahl) C.Agardh (uncertain)
596. Species Ceramium thymifolium Schousboe (uncertain)
597. Species Ceramium tortuosum Ducluzeau (uncertain)
598. Species Ceramium torulosum Roth (uncertain)
599. Species Ceramium transfugum (Kützing) Ardissone, 1871 (uncertain)
600. Species Ceramium trichocladis C.Agardh (uncertain)
601. Species Ceramium tumidulum Meneghini (uncertain)
602. Species Ceramium unilaterale Schousboe (uncertain)
603. Species Ceramium urceolatum (Dillwyn) Jürgens (uncertain)
604. Species Ceramium vertebrale H.E.Petersen (uncertain)
605. Species Ceramium verticillatum Delle Chiaje, 1829 (uncertain)
606. Species Ceramium virgatum J.D.Hooker & Harvey, 1848 (uncertain)

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