1. Species Ectocarpus acanthophorus Kützing
2. Species Ectocarpus acutus Setchell & N.L.Gardner, 1922
3. Species Ectocarpus adriaticus Ercegovic, 1955
4. Species Ectocarpus affinis Setchell & N.L.Gardner, 1922
5. Species Ectocarpus aleuticus Kützing, 1860
6. Species Ectocarpus auratus Bory de Saint-Vincent ex Kützing, 1849
7. Species Ectocarpus balakrishnanii V.Krishnamurthy, 2000
8. Species Ectocarpus barbadensis Kuckuck, 1963
9. Species Ectocarpus berteroanus Montagne, 1852
10. Species Ectocarpus bombycinus Kützing, 1849
11. Species Ectocarpus borealis (Kjellman) Kjellman, 1890
12. Species Ectocarpus bracchiolus Lindauer, 1949
13. Species Ectocarpus brevicellularis Noda, 1975
14. Species Ectocarpus caliacrae Celan, 1938
15. Species Ectocarpus capensis Kützing, 1849
16. Species Ectocarpus caspicus A.Henckel, 1909
17. Species Ectocarpus chantransioides Setchell & N.L.Gardner, 1922
18. Species Ectocarpus chapmanii Lindauer, 1960
19. Species Ectocarpus chnoosporae Børgesen, 1924
20. Species Ectocarpus cladosiphoniae Noda, 1969
21. Species Ectocarpus clavifer J.Agardh, 1854
22. Species Ectocarpus commensalis Setchell & N.L.Gardner, 1922
23. Species Ectocarpus commixtus Noda, 1972
24. Species Ectocarpus confervoides Harvey, 1855
25. Species Ectocarpus confusiophyllus Noda, 1969
26. Species Ectocarpus congregatus Zanardini
27. Species Ectocarpus constanciae Hariot, 1887
28. Species Ectocarpus corticulatus De A.Saunders, 1898
29. Species Ectocarpus crouanii Thuret, 1863
30. Species Ectocarpus crouaniorum Thuret, 1863
31. Species Ectocarpus cryptophilus Børgesen, 1939
32. Species Ectocarpus cymosus Zanardini
33. Species Ectocarpus cystophylloides Noda, 1970
34. Species Ectocarpus dellowianus Lindauer, 1960
35. Species Ectocarpus denudatus P.Crouan & H.Crouan, 1866
36. Species Ectocarpus dictyoptericola Noda, 1969
37. Species Ectocarpus divergens Kornmann, 1957
38. Species Ectocarpus ensenadanus N.L.Gardner, 1940
39. Species Ectocarpus erectus Kützing
40. Species Ectocarpus exiguus Skottsberg, 1907
41. Species Ectocarpus exilis Zanardini
42. Species Ectocarpus falklandicus Skottsberg, 1907
43. Species Ectocarpus fasciculatus Harvey, 1841
44. Species Ectocarpus fenestroides P.Crouan & H.Crouan, 1878
45. Species Ectocarpus flagelliferus Setchell & N.L.Gardner, 1922
46. Species Ectocarpus flagelliformis Kützing, 1843
47. Species Ectocarpus fructuosus Setchell & N.L.Gardner, 1922
48. Species Ectocarpus fulvescens Schousboe ex Thuret
49. Species Ectocarpus fungiformis Oltmanns, 1894
50. Species Ectocarpus fusiformis Nagai, 1941
51. Species Ectocarpus giraudiae J.Agardh ex Wilson, 1892
52. Species Ectocarpus glaziovii Zeller, 1876
53. Species Ectocarpus gonodioides Setchell & N.L.Gardner, 1924
54. Species Ectocarpus hamulosus Harvey & Bailey, 1851
55. Species Ectocarpus hancockii E.Y.Dawson, 1944
56. Species Ectocarpus heterocarpus P.L.Crouan & H.M.Crouan, 1878
57. Species Ectocarpus hornericola Noda, 1981
58. Species Ectocarpus humilis Kützing, 1849
59. Species Ectocarpus intermedius Kützing, 1843
60. Species Ectocarpus isopodicola E.Y.Dawson, 1946
61. Species Ectocarpus kellneri Meneghini
62. Species Ectocarpus kjellmanioides Noda, 1969
63. Species Ectocarpus laminariae Noda, 1971
64. Species Ectocarpus laurenciae Yamada, 1931
65. Species Ectocarpus lepasicola Noda, 1969
66. Species Ectocarpus lutescens Zanardini
67. Species Ectocarpus minor Noda, 1970
68. Species Ectocarpus minutissimus Skottsberg & Levring, 1941
69. Species Ectocarpus minutulus Montagne
70. Species Ectocarpus mitchelloides Noda, 1975
71. Species Ectocarpus monzensis Noda & Konno, 1973
72. Species Ectocarpus multifurcus Zanardini, 1947
73. Species Ectocarpus myurus Zanardini
74. Species Ectocarpus natans Zanardini
75. Species Ectocarpus niigatensis Noda, 1975
76. Species Ectocarpus nitens De Notaris, 1844
77. Species Ectocarpus oblongatus Noda, 1969
78. Species Ectocarpus obovatus Foslie, 1881
79. Species Ectocarpus obtusocarpus P.Crouan & H.Crouan, 1865
80. Species Ectocarpus obtusosus Noda, 1969
81. Species Ectocarpus ochraceus Kützing
82. Species Ectocarpus parvulus Kützing, 1849
83. Species Ectocarpus pectenis Ercegovic, 1955
84. Species Ectocarpus penicillatus (C.Agardh) Kjellman, 1890
85. Species Ectocarpus plasticola Noda, 1975
86. Species Ectocarpus plumosus Noda, 1970
87. Species Ectocarpus polysiphoniae Noda, 1975
88. Species Ectocarpus pumilus Zanardini
89. Species Ectocarpus radicans Zanardini
90. Species Ectocarpus rallsiae Vickers, 1905
91. Species Ectocarpus ramentaceus Zanardini
92. Species Ectocarpus repens Shperk
93. Species Ectocarpus rotundato-apicalis Noda & Honda, 1970
94. Species Ectocarpus rudis Zanardini
95. Species Ectocarpus rufulus Kützing, 1843
96. Species Ectocarpus rufus (Roth) C.Agardh, 1824
97. Species Ectocarpus sadoensis Noda, 1975
98. Species Ectocarpus sargassicaulinis Noda, 1969
99. Species Ectocarpus sargassiphyllus Noda
100. Species Ectocarpus saxatilis Zanardini
101. Species Ectocarpus scytosipohae Noda, 1975
102. Species Ectocarpus shiiyaensis Noda, 1974
103. Species Ectocarpus shimokitaensis Ohta, 1973
104. Species Ectocarpus siliculosus (Dillwyn) Lyngbye, 1819
105. Species Ectocarpus simpliciusculus C.Agardh, 1827
106. Species Ectocarpus simulans Setchell & N.L.Gardner, 1922
107. Species Ectocarpus sonorensis E.Y.Dawson, 1944
108. Species Ectocarpus spalatinus Kützing
109. Species Ectocarpus sphaericus Ohta, 1973
110. Species Ectocarpus strigosus Zanardini
111. Species Ectocarpus tamarinii Børgesen, 1941
112. Species Ectocarpus taoniae Setchell & N.L.Gardner, 1922
113. Species Ectocarpus tappiensis Ohta, 1973
114. Species Ectocarpus tasshaensis Noda, 1975
115. Species Ectocarpus trichophorus H.Gran, 1897
116. Species Ectocarpus tsugaruensis Ohta, 1973
117. Species Ectocarpus variabilis Vickers, 1905
118. Species Ectocarpus venetus Kützing
119. Species Ectocarpus vungtauensis P.H.Hô, 1969
120. Species Ectocarpus yezoensis Yamada & Tanaka, 1944
121. Species Ectocarpus zonariae W.R.Taylor, 1928
122. Species Ectocarpus zosterae Noda & Ohta, 1973
123. Species Ectocarpus abbreviatus Kützing, 1843 accepted as Ectocarpus fasciculatus var. abbreviatus (Kützing) Sauvageau, 1892 (synonym)
124. Species Ectocarpus acuminatus De A.Saunders, 1898 accepted as Feldmannia acuminata (De A.Saunders) Hollenberg & I.A.Abbott, 1966
125. Species Ectocarpus acuto-ramulis Noda, 1969 accepted as Hincksia acutoramulis (Noda) R.X.Luan, 2009
126. Species Ectocarpus aecidioides Rosenvinge, 1893 accepted as Laminariocolax aecidioides (Rosenvinge) A.F.Peters, 1998
127. Species Ectocarpus amicorum Harvey accepted as Ectocarpus indicus Sonder, 1854 accepted as Feldmannia indica (Sonder) Womersley & A.Bailey, 1970
128. Species Ectocarpus amphibius Harvey, 1848 accepted as Ectocarpus siliculosus var. subulatus (Kützing) T.Gallardo, 1992 accepted as Ectocarpus siliculosus var. dasycarpus (Kuckuck) Gallardo, 1992 (synonym)
129. Species Ectocarpus antillarum Grunow, 1868 accepted as Bachelotia antillarum (Grunow) Gerloff, 1959
130. Species Ectocarpus approximatus Kützing, 1849 accepted as Ectocarpus flagelliformis Kützing, 1843
131. Species Ectocarpus arabicus Figari & De Notaris, 1853 accepted as Feldmannia irregularis (Kützing) Hamel, 1939 (synonym)
132. Species Ectocarpus arabicus Kützing, 1855 accepted as Feldmannia irregularis (Kützing) Hamel, 1939
133. Species Ectocarpus arctus Kützing, 1843 accepted as Ectocarpus siliculosus var. arctus (Kützing) Gallardo, 1992 (synonym)
134. Species Ectocarpus battersii Bornet ex Sauvageau, 1895 accepted as Kuetzingiella battersii (Bornet ex Sauvageau) Kornmann, 1956 (synonym)
135. Species Ectocarpus battersiides Ercegovic, 1955 accepted as Feldmannia battersiides (Ercegovic) Cormaci & G.Furnari, 1987
136. Species Ectocarpus brachiatus Harvey, 1841 accepted as Stictyosiphon griffithsianus (Le Jolis) Holmes & Batters, 1890
137. Species Ectocarpus brachiatus (C.Agardh) C.Agardh, 1824 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
138. Species Ectocarpus breviarticulatus J.Agardh, 1847 accepted as Asteronema breviarticulatum (J.Agardh) Ouriques & Bouzon, 2000
139. Species Ectocarpus brevis Sauvageau, 1892 accepted as Streblonema breve (Sauvageau) De Toni, 1895
140. Species Ectocarpus bryantii Setchell & N.L.Gardner, 1924 accepted as Hincksia bryantii (Setchell & N.L.Gardner) J.N.Norris, 2001 (synonym)
141. Species Ectocarpus caespitulus J.Agardh, 1842 accepted as Feldmannia lebelii (Areschoug ex P.Crouan & H.Crouan) Hamel, 1939
142. Species Ectocarpus caespitulus Kjellman, 1872 accepted as Feldmannia kjellmanii Kylin, 1947 (synonym)
143. Species Ectocarpus ceratoides Kützing, 1849 accepted as Ectocarpus flagelliformis Kützing, 1843
144. Species Ectocarpus chalybeus (Roth) Lyngbye, 1819 accepted as Audouinella chalybea (Roth) Bory, 1823
145. Species Ectocarpus chitonicola De A.Saunders, 1898 accepted as Feldmannia chitonicola (De A.Saunders) Levring, 1960
146. Species Ectocarpus chordariae Farlow, 1881 accepted as Streblonema chordariae (Farlow) De Toni, 1895 (synonym)
147. Species Ectocarpus clandestinus (P.Crouan & H.Crouan) Sauvageau, 1892 accepted as Myriactula clandestina (P.Crouan & H.Crouan) Feldmann, 1945 (synonym)
148. Species Ectocarpus columellaris Børgesen, 1936 accepted as Feldmannia columellaris (Børgesen) Islam, 1976
149. Species Ectocarpus compactus (Roth) C.Agardh, 1828 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
150. Species Ectocarpus confervoides Le Jolis, 1863 accepted as Ectocarpus siliculosus (Dillwyn) Lyngbye, 1819
151. Species Ectocarpus congestus P.L.Crouan & H.M.Crouan, 1867 accepted as Ectocarpus fasciculatus var. congestus (P.L.Crouan & H.M.Crouan) Batters, 1902 (synonym)
152. Species Ectocarpus conifer Børgesen, 1914 accepted as Hincksia conifera (Børgesen) I.A.Abbott, 1989
153. Species Ectocarpus coniger Børgesen, 1935 accepted as Feldmannia irregularis (Kützing) Hamel, 1939
154. Species Ectocarpus criniger Kuckuck, 1895 accepted as Kuckuckia spinosa (Kützing) Kornmann, 1958
155. Species Ectocarpus crinitus Carmichael, 1833 accepted as Acinetospora crinita (Carmichael) Sauvageau, 1899
156. Species Ectocarpus cylindricus De A.Saunders, 1898 accepted as Feldmannia simplex (P.Crouan & H.Crouan) Hamel, 1939
157. Species Ectocarpus dalmaticus Ercegovic, 1955 accepted as Hincksia dalmatica (Ercegovic) Cormaci & G.Furnari, 1992
158. Species Ectocarpus dasycarpus Kuckuck, 1891 accepted as Ectocarpus siliculosus var. dasycarpus (Kuckuck) Gallardo, 1992 (synonym)
159. Species Ectocarpus deformans P.J.L.Dangeard, 1931 accepted as Laminariocolax tomentosoides subsp. deformans (P.J.L.Dangeard) A.F.Peters, 2003 (synonym)
160. Species Ectocarpus densus Lyngbye, 1819 accepted as Desmarestia aculeata (Linnaeus) J.V.Lamouroux, 1813
161. Species Ectocarpus dermonematis Børgesen, 1937 accepted as Hamelella dermonematis (Børgesen) K.Srinivasan, 1965
162. Species Ectocarpus desmarestiae H.Gran, 1897 accepted as Herponema desmarestiae (H.Gran) Cardinal, 1964
163. Species Ectocarpus dimorphus P.C.Silva, 1957 accepted as Ectocarpus commensalis Setchell & N.L.Gardner, 1922 (synonym)
164. Species Ectocarpus draparnaldioides (P.L.Crouan & H.M.Crouan) Kjellman, 1872 accepted as Ectocarpus fasciculatus Harvey, 1841
165. Species Ectocarpus duchassaingianus Grunow, 1868 accepted as Feldmannia duchassaingiana (Grunow) Aisha & Shameel, 2011
166. Species Ectocarpus elachistaeformis Heydrich, 1892 accepted as Kuetzingiella elachistaeformis (Heydrich) M.Balakrishnan & Kinkar, 1981 (synonym)
167. Species Ectocarpus elegans Thuret, 1863 accepted as Hincksia sandriana (Zanardini) P.C.Silva, 1987
168. Species Ectocarpus ellipticus De A.Saunders, 1898 accepted as Spongonema tomentosum (Hudson) Kützing, 1849
169. Species Ectocarpus enhali Børgesen, 1937 accepted as Hecatonema enhali (Børgesen) M.S.Balakrishnan & V.N.Kinkar, 1981
170. Species Ectocarpus eramosus Setchell & N.L.Gardner, 1922 accepted as Ectocarpus parvus (De A.Saunders) Hollenberg, 1971 accepted as Ectocarpus commensalis Setchell & N.L.Gardner, 1922
171. Species Ectocarpus fasciculatus Kützing, 1843 accepted as Ectocarpus flagelliformis Kützing, 1843
172. Species Ectocarpus fenestratus Berkeley ex Harvey, 1849 accepted as Hincksia fenestrata (Berkeley ex Harvey) P.C.Silva, 1987
173. Species Ectocarpus ferrugineus C.Agardh, 1824 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
174. Species Ectocarpus filamentosus Noda, 1970 accepted as Acinetospora filamentosa (Noda) Yaegashi, Uwai & Kogame, 2015
175. Species Ectocarpus filifer Børgesen, 1937 accepted as Feldmannia filifera (Børgesen) P.H.Hô, 1969
176. Species Ectocarpus firmus (C.Agardh) J.Agardh, 1848 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
177. Species Ectocarpus flocculiformis Setchell & N.L.Gardner, 1922 accepted as Feldmannia simplex (P.Crouan & H.Crouan) Hamel, 1939
178. Species Ectocarpus fluviatilis Kützing, 1843 accepted as Pylaiella littoralis f. fluviatilis (Kützing) Hauck, 1884
179. Species Ectocarpus formosanus Yamada, 1950 accepted as Feldmannia formosana (Yamada) Itono, 1973
180. Species Ectocarpus fuscatus Zanardini, 1846 accepted as Hincksia fuscata (Zanardini) P.C.Silva, 1987
181. Species Ectocarpus geminatus J.D.Hooker & Harvey, 1845 accepted as Geminocarpus geminatus (J.D.Hooker & Harvey) Skottsberg, 1907
182. Species Ectocarpus geminifructus Børgesen, 1937 accepted as Hamelella geminifructa (Børgesen) K.Srinivasan, 1965
183. Species Ectocarpus geniculatus Ercegovic, 1955 accepted as Hincksia geniculata (Ercegovic) Cormaci & G.Furnari, 1992
184. Species Ectocarpus ghardaqaensis Nasr, 1939 accepted as Hincksia ghardaqaensis (Nasr) P.C.Silva, 1987
185. Species Ectocarpus globifer Kützing, 1843 accepted as Feldmannia globifera (Kützing) G.Hamel, 1939
186. Species Ectocarpus granulosoides Setchell & N.L.Gardner, 1922 accepted as Hincksia sandriana (Zanardini) P.C.Silva, 1987 (synonym)
187. Species Ectocarpus granulosus (Smith) C.Agardh, 1828 accepted as Hincksia granulosa (Smith) P.C.Silva, 1987
188. Species Ectocarpus griffithsianus Le Jolis, 1863 accepted as Stictyosiphon griffithsianus (Le Jolis) Holmes & Batters, 1890
189. Species Ectocarpus guadelupensis P.Crouan & H.Crouan, 1865 accepted as Feldmannia irregularis (Kützing) Hamel, 1939
190. Species Ectocarpus hamatus P.L.Crouan & H.M.Crouan, 1865 accepted as Asteronema breviarticulatum (J.Agardh) Ouriques & Bouzon, 2000
191. Species Ectocarpus hansteeni Foslie, 1894 accepted as Ectocarpus siliculosus (Dillwyn) Lyngbye, 1819
192. Species Ectocarpus hauckii Ercegovic, 1955 accepted as Hincksia hauckii (Ercegovic) Cormaci & G.Furnari, 1992
193. Species Ectocarpus helophorus Rosenvinge, 1898 accepted as Streblonema helophorum (Rosenvinge) Batters, 1902 (synonym)
194. Species Ectocarpus hemisphericus De A.Saunders, 1898 accepted as Feldmannia hemispherica (De A.Saunders) Hollenberg, 1971
195. Species Ectocarpus hiemalis Noda, 1971 accepted as Ectocarpus niigatensis Noda, 1975
196. Species Ectocarpus hiemalis P.L.Crouan & H.M.Crouan, 1867 accepted as Ectocarpus siliculosus var. hiemalis (P.L.Crouan & H.M.Crouan) Gallardo, 1992 (synonym)
197. Species Ectocarpus hincksiae Harvey, 1841 accepted as Hincksia hincksiae (Harvey) P.C.Silva, 1987
198. Species Ectocarpus holmesii Batters, 1888 accepted as Kuetzingiella holmesii (Batters) G.Russell, 1956
199. Species Ectocarpus holmii Rosenvinge, 1893 accepted as Hincksia ovata (Kjellman) P.C.Silva, 1987
200. Species Ectocarpus humilis Reinsch, 1890 accepted as Ectocarpus exiguus Skottsberg, 1907 (synonym)
201. Species Ectocarpus indicus Sonder, 1854 accepted as Feldmannia indica (Sonder) Womersley & A.Bailey, 1970
202. Species Ectocarpus intricatus accepted as Botrytella reinboldii (Reinke) Kornmann & Sahling, 1988
203. Species Ectocarpus investiens Hauck, 1885 accepted as Cylindrocarpus microscopicus P.L.Crouan & H.M.Crouan, 1851
204. Species Ectocarpus irregularis Kützing, 1845 accepted as Feldmannia irregularis (Kützing) Hamel, 1939 (synonym)
205. Species Ectocarpus iwadatensis accepted as Botrytella reinboldii (Reinke) Kornmann & Sahling, 1988
206. Species Ectocarpus izuensis Segawa, 1941 accepted as Feldmannia irregularis (Kützing) Hamel, 1939
207. Species Ectocarpus landsburgii Harvey, 1849 accepted as Ectocarpus fasciculatus Harvey, 1841
208. Species Ectocarpus lebelii Areschoug ex P.Crouan & H.Crouan, 1867 accepted as Feldmannia lebelii (Areschoug ex P.Crouan & H.Crouan) Hamel, 1939
209. Species Ectocarpus littoralis (Linnaeus) Lyngbye, 1819 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872 (synonym)
210. Species Ectocarpus longifructus Harvey, 1849 accepted as Pylaiella littoralis (Linnaeus) Kjellman, 1872
211. Species Ectocarpus lucifugus Kuckuck, 1897 accepted as Pleurocladia lucifuga (Kuckuck) Wilce, 1966
212. Species Ectocarpus lumbricalis Kützing, 1845 accepted as Halothrix lumbricalis (Kützing) Reinke, 1888
213. Species Ectocarpus luteolus Sauvageau, 1892 accepted as Spongonema tomentosum (Hudson) Kützing, 1849
214. Species Ectocarpus maculans P.A.Dangeard, 1934 accepted as Streblonema maculans G.R.South & Tittley, 1986
215. Species Ectocarpus maritimus (Kjellman) Rosenvinge, 1910 accepted as Pleurocladia lacustris A.Braun, 1855
216. Species Ectocarpus mertensi (Turner) C.Agardh, 1828 accepted as Tilopteris mertensii (Turner) Kützing, 1849
217. Species Ectocarpus mesogloiae Setchell & N.L.Gardner, 1922 accepted as Ectocarpus parvus (De A.Saunders) Hollenberg, 1971 accepted as Ectocarpus commensalis Setchell & N.L.Gardner, 1922
218. Species Ectocarpus microscopicus (P.L.Crouan & H.M.Crouan) Batters, 1902 accepted as Cylindrocarpus microscopicus P.L.Crouan & H.M.Crouan, 1851
219. Species Ectocarpus microspongius Batters, 1897 accepted as Compsonema microspongium (Batters) Kornmann, 1953 (synonym)
220. Species Ectocarpus minimus Nägeli accepted as Spongonema tomentosum (Hudson) Kützing, 1849
221. Species Ectocarpus minutus C.Agardh, 1827 accepted as Compsonema minutum (C.Agardh) Kuckuck, 1953
222. Species Ectocarpus mitchelliae Harvey, 1851 (unaccepted, synonym)
223. Species Ectocarpus monocarpus C.Agardh, 1820 (unaccepted)
224. Species Ectocarpus mucronatus De A.Saunders, 1898 (unaccepted)
225. Species Ectocarpus myriocladiae P.L.Crouan & H.M.Crouan, 1867 (unaccepted)
226. Species Ectocarpus nanus Levring, 1938 (unaccepted)
227. Species Ectocarpus nebulosus (C.Agardh) Zanardini, 1843 (unaccepted)
228. Species Ectocarpus oedogonium Meneghini, 1845 (unaccepted, synonym)
229. Species Ectocarpus onustus Kützing, 1849 (unaccepted)
230. Species Ectocarpus ovatus Kjellman, 1877 (unaccepted, synonym)
231. Species Ectocarpus oviger Harvey, 1862 (unaccepted)
232. Species Ectocarpus padinae (Buffham) Sauvageau, 1896 (unaccepted)
233. Species Ectocarpus paradoxoides Ercegovic, 1955 (unaccepted)
234. Species Ectocarpus paradoxus Montagne, 1839 (unaccepted, synonym)
235. Species Ectocarpus parasiticus Sauvageau, 1892 (unaccepted)
236. Species Ectocarpus parksii Setchell & N.L.Gardner, 1924 (unaccepted, synonym)
237. Species Ectocarpus parvus (De A.Saunders) Hollenberg, 1971 (unaccepted, synonym)
238. Species Ectocarpus pectinatus Skottsberg, 1907 (unaccepted)
239. Species Ectocarpus polycarpus Kjellman, 1872 (unaccepted, synonym)
240. Species Ectocarpus pringsheimi Reinke, 1889 (unaccepted)
241. Species Ectocarpus pulvinatus H.Gran, 1897 (unaccepted)
242. Species Ectocarpus pusillus Harvey, 1841 (unaccepted)
243. Species Ectocarpus pycnocarpus Rosenvinge, 1893 (unaccepted, synonym)
244. Species Ectocarpus pygmaeus J.E.Areschoug, 1872 (unaccepted, synonym)
245. Species Ectocarpus ramellosus Kützing, 1845 (unaccepted, synonym)
246. Species Ectocarpus recurvatus Kuckuck, 1961 (unaccepted)
247. Species Ectocarpus refractus Kützing, 1843 (unaccepted, synonym)
248. Species Ectocarpus reinboldii Reinke, 1892 (unaccepted)
249. Species Ectocarpus repens Reinke, 1889 (unaccepted, synonym)
250. Species Ectocarpus reptans P.L.Crouan & H.M.Crouan, 1867 (unaccepted)
251. Species Ectocarpus rhodochortonoides Børgesen, 1914 (unaccepted, synonym)
252. Species Ectocarpus sandrianus Zanardini, 1843 (unaccepted, synonym)
253. Species Ectocarpus saundersii Setchell & N.L.Gardner, 1922 (unaccepted)
254. Species Ectocarpus secundus Kützing, 1847 (unaccepted)
255. Species Ectocarpus simplex P.Crouan & H.Crouan, 1867 (unaccepted)
256. Species Ectocarpus simpliusculus C. Agardh, 1827 (unaccepted)
257. Species Ectocarpus sliculosus (unaccepted)
258. Species Ectocarpus socialis Setchell & N.L.Gardner, 1922 (unaccepted)
259. Species Ectocarpus solitarius Sauvageau, 1892 (unaccepted)
260. Species Ectocarpus sordidus Harvey, 1859 (unaccepted)
261. Species Ectocarpus speciosus (Børgesen) Kuckuck, 1922 (unaccepted, synonym)
262. Species Ectocarpus sphaericus Derbès & Solier, 1851 (unaccepted)
263. Species Ectocarpus sphaerophorus Carmichael, 1833 (unaccepted)
264. Species Ectocarpus spinosus Kützing, 1843 (unaccepted)
265. Species Ectocarpus spongiosus Dickie, 1874 (unaccepted)
266. Species Ectocarpus spongodioides P.Crouan & H.Crouan, 1878 (unaccepted)
267. Species Ectocarpus stilophorae P.Crouan & H.Crouan, 1867 (unaccepted, synonym)
268. Species Ectocarpus subcorymbosus Farlow ex Holden, 1905 (unaccepted)
269. Species Ectocarpus subulatus Kützing, 1843 (unaccepted, synonym)
270. Species Ectocarpus subverticillatus Kützing, 1845 (unaccepted)
271. Species Ectocarpus tenellus Noda, 1969 (unaccepted)
272. Species Ectocarpus tenellus Kützing, 1849 (unaccepted)
273. Species Ectocarpus terminalis Kützing, 1845 (unaccepted, synonym)
274. Species Ectocarpus thyrsoideus Børgesen, 1937 (unaccepted)
275. Species Ectocarpus tomentosoides Farlow, 1889 (unaccepted, synonym)
276. Species Ectocarpus tomentosus (Hudson) Lyngbye, 1819 (unaccepted, synonym)
277. Species Ectocarpus tortugensis W.R.Taylor, 1928 (unaccepted, synonym)
278. Species Ectocarpus turnerellae Foslie, 1896 (unaccepted)
279. Species Ectocarpus ugoensis Konno, 1974 (unaccepted)
280. Species Ectocarpus valiantei Bornet ex Sauvageau, 1892 (unaccepted)
281. Species Ectocarpus vanbosseae Setchell & N.L.Gardner, 1924 (unaccepted)
282. Species Ectocarpus variabilis (De A.Saunders) G.M.Smith, 1942 (unaccepted, synonym)
283. Species Ectocarpus vaughanii Børgesen, 1941 (unaccepted)
284. Species Ectocarpus velutinus (Greville) Kützing, 1845 (unaccepted)
285. Species Ectocarpus ventus Kützing (unaccepted, synonym)
286. Species Ectocarpus vidovichii Meneghini ex Zanardini, 1843 (unaccepted)
287. Species Ectocarpus virescens Thuret ex Sauvageau, 1896 (unaccepted, synonym)
288. Species Ectocarpus volubilis (P.L.Crouan & H.M.Crouan) P.L.Crouan & H.M.Crouan, 1867 (unaccepted, synonym)
289. Species Ectocarpus zanardinii P.L.Crouan & H.M.Crouan, 1867 (unaccepted)
290. Species Ectocarpus zeylanicus Børgesen, 1936 (unaccepted, synonym)
291. Species Ectocarpus arachnoideus Zanardini (uncertain)
292. Species Ectocarpus bornetii Hamel (uncertain)
293. Species Ectocarpus brachiatus (Smith) S.F.Gray, 1821 (uncertain)
294. Species Ectocarpus castaneus Kützing (uncertain)
295. Species Ectocarpus chiloensis Reinsch (uncertain)
296. Species Ectocarpus corymbosus Kützing (uncertain)
297. Species Ectocarpus crassicaulis P.Crouan & H.Crouan (uncertain)
298. Species Ectocarpus cruciatus C.Agardh (uncertain)
299. Species Ectocarpus debilis Harvey (uncertain)
300. Species Ectocarpus dietziae Harvey (uncertain)
301. Species Ectocarpus distortus Carmichael, 1833 (uncertain)
302. Species Ectocarpus divaricatus Kützing (uncertain)
303. Species Ectocarpus durkeei Harvey (uncertain)
304. Species Ectocarpus elongatus Bory de Saint-Vincent (uncertain)
305. Species Ectocarpus farlowii Thuret (uncertain)
306. Species Ectocarpus flavescens Kützing (uncertain)
307. Species Ectocarpus fragilis Zanardini (uncertain)
308. Species Ectocarpus glandiformis Zanardini (uncertain)
309. Species Ectocarpus glomeratus Thuret (uncertain)
310. Species Ectocarpus gracillimus Kützing (uncertain)
311. Species Ectocarpus hooperi Harvey (uncertain)
312. Species Ectocarpus hyemalis P.Crouan & H.Crouan (uncertain)
313. Species Ectocarpus incomptus Meneghini (uncertain)
314. Species Ectocarpus insignis P.Crouan & H.Crouan (uncertain)
315. Species Ectocarpus kochianus Kützing (uncertain)
316. Species Ectocarpus laetus C.Agardh (uncertain)
317. Species Ectocarpus lanosus Kützing (uncertain)
318. Species Ectocarpus lutosus Harvey (uncertain)
319. Species Ectocarpus macrocarpus P.Crouan & H.Crouan, 1878 (uncertain)
320. Species Ectocarpus macrocarpus Harvey, 1857 (uncertain)
321. Species Ectocarpus meneghinii Dufour (uncertain)
322. Species Ectocarpus moniliformis Vickers (uncertain)
323. Species Ectocarpus notarisii Meneghini (uncertain)
324. Species Ectocarpus ochroleucus Kützing (uncertain)
325. Species Ectocarpus octosporus Harvey (uncertain)
326. Species Ectocarpus oophorus Kützing (uncertain)
327. Species Ectocarpus ostendensis Askenasy (uncertain)
328. Species Ectocarpus patens Kützing (uncertain)
329. Species Ectocarpus pseudosiliculosus P.Crouan & H.Crouan (uncertain)
330. Species Ectocarpus racemiferus Meneghini (uncertain)
331. Species Ectocarpus reticulosus Harvey (uncertain)
332. Species Ectocarpus rigidissimus Zanardini (uncertain)
333. Species Ectocarpus rigidulus Kützing (uncertain)
334. Species Ectocarpus rigidus Kützing (uncertain)
335. Species Ectocarpus rivularis Wolle (uncertain)
336. Species Ectocarpus rugicus Reinsch (uncertain)
337. Species Ectocarpus ruprechtii Shperk (uncertain)
338. Species Ectocarpus rutilans Kützing (uncertain)
339. Species Ectocarpus scorpioides Harvey (uncertain)
340. Species Ectocarpus sorocarpoides Takamatsu (uncertain)
341. Species Ectocarpus squarrosus Kützing (uncertain)
342. Species Ectocarpus stoloniferus Reinsch (uncertain)
343. Species Ectocarpus symphyocladiophilus Noda (uncertain)
344. Species Ectocarpus tenellus (Kützing) Zanardini, 1847 (uncertain)
345. Species Ectocarpus tergestinus Reinsch (uncertain)
346. Species Ectocarpus tesselatus F.W.Hayden, 1851 (uncertain)
347. Species Ectocarpus thuretii Le Jolis (uncertain)
348. Species Ectocarpus uncinatus P.Crouan & H.Crouan (uncertain)
349. Species Ectocarpus vermicelliferus De Notaris (uncertain)
350. Species Ectocarpus verminosus Kützing (uncertain)
351. Species Ectocarpus villum Harvey (uncertain)
352. Species Ectocarpus virgatus Kützing (uncertain)
353. Species Ectocarpus viridis Harvey (uncertain)

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