1. Species Gigartina ancistroclada Montagne, 1845
2. Species Gigartina angulata J.Agardh, 1876
3. Species Gigartina articulata (Turner) J.V.Lamouroux
4. Species Gigartina brachiata Harvey, 1859
5. Species Gigartina bracteata (S.G.Gmelin) Setchell & N.L.Gardner, 1933
6. Species Gigartina cartilaginea (Linnaeus) S.F.Gray
7. Species Gigartina chondroides Bory, 1828
8. Species Gigartina chondrus J.E. Areschoug
9. Species Gigartina circumcinta
10. Species Gigartina clavifera J.Agardh, 1876
11. Species Gigartina confervoides
12. Species Gigartina contorta Bory de Saint-Vincent
13. Species Gigartina coronopifolia (Goodenough & Woodward) S.F.Gray, 1821
14. Species Gigartina coronopifolia (Zoega) P.C.Silva, 1952
15. Species Gigartina cranwelliae Laing, 1939
16. Species Gigartina crassa Plante
17. Species Gigartina crocea Kützing
18. Species Gigartina cuculata Areschoug
19. Species Gigartina cylindrica Despréaux
20. Species Gigartina densa Edyvane & Womersley, 1994
21. Species Gigartina dilitata (J.D.Hooker & Harvey) N.M.Adams, 1994
22. Species Gigartina disticha Sonder, 1845
23. Species Gigartina divaricata J.D.Hooker & Harvey, 1845
24. Species Gigartina divergens (C.Agardh) Greville
25. Species Gigartina dura (Agardh) Greville
26. Species Gigartina durvillei J.V.Lamouroux
27. Species Gigartina ewenii W.A.Nelson & R.D'Archino, 2014
28. Species Gigartina falshawiae D'Archino & W.A.Nelson, 2019
29. Species Gigartina fissa (Suhr) J.Agardh, 1876
30. Species Gigartina flabellata Kützing, 1849
31. Species Gigartina flavescens Bory de Saint-Vincent
32. Species Gigartina gelatinosa Endlicher orth.mut.
33. Species Gigartina gelatinosa J.Agardh
34. Species Gigartina grandifida J.Agardh, 1876
35. Species Gigartina helminthochorton (Schwendimann) J.V.Lamouroux
36. Species Gigartina hypniformis Bory de Saint-Vincent
37. Species Gigartina hystrix (Agardh) Setchell & Gardner
38. Species Gigartina imperialis Papenfuss, 1976
39. Species Gigartina insignis (Endlicher & Diesing) F.Schmitz, 1896
40. Species Gigartina kaliformis (Goodenough & Woodward) J.V.Lamouroux
41. Species Gigartina kleuzeana (Kützing) Sonder
42. Species Gigartina kroneana Rabenhorst, 1878
43. Species Gigartina laciniata J.Agardh, 1876
44. Species Gigartina laingii Lindauer ex V.J.Chapman, 1979
45. Species Gigartina lemaniformis Bory de Saint-Vincent
46. Species Gigartina lessonii (Bory) J.Agardh, 1851
47. Species Gigartina lindleyana (J.Agardh) Endlicher
48. Species Gigartina macrocarpa J.Agardh, 1876
49. Species Gigartina melanotrix Bory de Saint-Vincent
50. Species Gigartina microcarpa Sonder
51. Species Gigartina minima Kylin, 1938
52. Species Gigartina minuta V.J.Chapman, 1979
53. Species Gigartina muelleriana Setchell & N.L.Gardner, 1933
54. Species Gigartina multidichotoma E.Y.Dawson, 1961
55. Species Gigartina nana (C.Agardh) J.Agardh
56. Species Gigartina notarisii Piccone
57. Species Gigartina obtusiloba (E.S.Sinova) Kim
58. Species Gigartina orbitosa J.Agardh
59. Species Gigartina pachymenioides Lindauer, 1949
60. Species Gigartina paitensis W.R.Taylor, 1947
61. Species Gigartina paxillata Papenfuss, 1947
62. Species Gigartina pilosa J.V.Lamouroux
63. Species Gigartina pinnata J.Agardh, 1851
64. Species Gigartina pistillaris
65. Species Gigartina pistillata (S.G.Gmelin) Stackhouse, 1809
66. Species Gigartina polycarpa (Kützing) Setchell & N.L.Gardner, 1933
67. Species Gigartina punctata (Suringar) Hariot
68. Species Gigartina recurva Edyvane & Womersley, 1994
69. Species Gigartina rostrata 'Griffiths'
70. Species Gigartina rotunda (Turner) Lamouroux
71. Species Gigartina rubens J.Agardh, 1899
72. Species Gigartina runcinata Grunow, 1868
73. Species Gigartina scabiosa (Kützing) Papenfuss
74. Species Gigartina skottsbergii Setchell & N.L.Gardner, 1936
75. Species Gigartina sonderi Edyvane & Womersley, 1994
76. Species Gigartina spinifera Kützing
77. Species Gigartina tenuissima (Turner) J.V.Lamouroux
78. Species Gigartina textorii (Suringar) Hariot
79. Species Gigartina tysonii Reinbold, 1912
80. Species Gigartina valdiviae Reinbold
81. Species Gigartina wehliae Sonder, 1871
82. Species Gigartina wrightii Harvey
83. Species Gigartina acicularis (Roth) J.V.Lamouroux, 1813 accepted as Chondracanthus acicularis (Roth) Fredericq, 1993 (synonym)
84. Species Gigartina aciculifera Zanardini, 1874 accepted as Gigartina brachiata Harvey, 1859
85. Species Gigartina aculeata (Hering) Kützing, 1868 accepted as Gracilaria aculeata (Hering) Papenfuss, 1967
86. Species Gigartina affinis Harvey, 1860 accepted as Polyopes affinis (Harvey) Kawaguchi & Wang, 2002
87. Species Gigartina affinis (Harvey) D.H.Kim, 1976 accepted as Mazzaella affinis (Harvey) Fredericq, 1993
88. Species Gigartina agardhii Setchell & N.L.Gardner, 1933 accepted as Mastocarpus agardhii (Setchell & N.L.Gardner) S.C.Lindstrom, Hughey & Martone, 2011 (synonym)
89. Species Gigartina alveata (Turner) J.Agardh, 1851 accepted as Psilophycus alveatus (Turner) W.A.Nelson, Leister & Hommersand, 2011 (synonym)
90. Species Gigartina antarctica D.H.Kim, 1976 accepted as Iridaea cordata (Turner) Bory, 1826
91. Species Gigartina apoda J.Agardh, 1899 accepted as Sarcothalia circumcincta (J.Agardh) Hommersand, 1993
92. Species Gigartina armata J.Agardh, 1899 accepted as Chondracanthus spinosus (Kützing) Guiry, 1993
93. Species Gigartina armata (C.Agardh) J.Agardh ex De Notaris, 1842 accepted as Gracilaria armata (C.Agardh) Greville, 1830 (synonym)
94. Species Gigartina articulata (Hudson) Lamouroux, 1813 accepted as Lomentaria articulata (Hudson) Lyngbye, 1819 (synonym)
95. Species Gigartina asperifolia J.Agardh, 1899 accepted as Chondracanthus spinosus (Kützing) Guiry, 1993
96. Species Gigartina atropurpurea (J.Agardh) J.Agardh, 1885 accepted as Sarcothalia atropurpurea (J.Agardh) Hommersand, 1993
97. Species Gigartina batracopus Bory de Saint-Vincent, 1828 accepted as Laurencia batracopus (Bory de Saint-Vincent) Greville, 1830 (synonym)
98. Species Gigartina binderi Harvey, 1863 accepted as Gigartina brachiata Harvey, 1859
99. Species Gigartina binghamiae J.Agardh, 1899 accepted as Chondracanthus corymbiferus (Kützing) Guiry, 1993
100. Species Gigartina boryana (Setchell & N.L.Gardner) D.H.Kim, 1976 accepted as Mazzaella laminarioides (Bory) Fredericq, 1993 (synonym)
101. Species Gigartina boryi Setchell & N.L.Gardner, 1933 accepted as Chondracanthus harveyanus (Kützing) Guiry, 1993 (synonym)
102. Species Gigartina burmannii (C.Agardh) J.Agardh, 1842 accepted as Sarcothalia stiriata (Turner) Leister, 1993
103. Species Gigartina caespitipes (Setchell & N.L.Gardner) D.H.Kim, 1976 accepted as Iridaea cordata (Turner) Bory, 1826
104. Species Gigartina californica J.Agardh, 1899 accepted as Chondracanthus corymbiferus (Kützing) Guiry, 1993
105. Species Gigartina canaliculata Harvey, 1840 accepted as Chondracanthus canaliculatus (Harvey) Guiry, 1993
106. Species Gigartina capensis (J.Agardh) D.H.Kim, 1976 accepted as Mazzaella capensis (J.Agardh) Fredericq, 1993 (synonym)
107. Species Gigartina chamissoi (C.Agardh) J.Agardh, 1842 accepted as Chondracanthus chamissoi (C.Agardh) Kützing, 1843
108. Species Gigartina chapmanii J.D.Hooker & Harvey, 1855 accepted as Chondracanthus chapmanii (J.D.Hooker & Harvey) Fredericq, 1994
109. Species Gigartina chauvinii (Bory de Saint-Vincent) J.Agardh, 1842 accepted as Chondracanthus chauvinii (Bory) Kützing, 1843
110. Species Gigartina chilensis D.H.Kim, 1976 accepted as Chondrus canaliculatus (C.Agardh) Greville, 1830 (synonym)
111. Species Gigartina chondroides Hooker f. & Harvey, 1847 accepted as Gigartina muelleriana Setchell & N.L.Gardner, 1933
112. Species Gigartina ciliata (Kützing) D.H.Kim, 1976 accepted as Iridaea ciliata Kützing, 1849 (synonym)
113. Species Gigartina cincinnalis Zanardini, 1874 accepted as Mychodea hamata Harvey, 1860 (synonym)
114. Species Gigartina circumcincta J.Agardh, 1876 accepted as Sarcothalia circumcincta (J.Agardh) Hommersand, 1993
115. Species Gigartina clathrata (Decaisne) Rabenhorst, 1878 accepted as Gigartina bracteata (S.G.Gmelin) Setchell & N.L.Gardner, 1933
116. Species Gigartina clavellosa (Turner) J.V.Lamouroux, 1813 accepted as Lomentaria clavellosa (Lightfoot ex Turner) Gaillon, 1828
117. Species Gigartina cobiniae (E.Y.Dawson) D.H.Kim, 1976 accepted as Mazzaella cobinae (E.Y.Dawson) Fredericq, 1993 (synonym)
118. Species Gigartina compressa (C.Agardh) W.J.Hooker, 1833 accepted as Gracilaria bursa-pastoris (S.G.Gmelin) P.C.Silva, 1952
119. Species Gigartina compressa Kützing, 1843 accepted as Gigartina acicularis var. compressa (Kützing) Frauenfeld, 1854 (synonym)
120. Species Gigartina conferta Schousboe ex Montagne, 1839 accepted as Gracilaria conferta (Schousboe ex Montagne) Montagne, 1846
121. Species Gigartina congesta Zanardini, 1874 accepted as Gigartina densa Edyvane & Womersley, 1994
122. Species Gigartina congesta (R.Brown ex Turner) Greville, 1830 accepted as Areschougia congesta (R.Brown ex Turner) J.Agardh, 1872 (synonym)
123. Species Gigartina convoluta Areschoug ex J.Agardh, 1899 accepted as Mazzaella convoluta (Areschoug ex J.Agardh) Hommersand, 1994
124. Species Gigartina cordata (Turner) D.H.Kim, 1976 accepted as Iridaea cordata (Turner) Bory, 1826
125. Species Gigartina coriacea (E.Y.Dawson) D.H.Kim, 1976 accepted as Mazzaella coriacea (E.Y.Dawson) Hughey, 1999 (synonym)
126. Species Gigartina cornea (Hudson) S.F.Gray, 1821 accepted as Gelidium corneum (Hudson) J.V.Lamouroux, 1813
127. Species Gigartina cornopifolia (Zoega) P.C.Silva, 1952 accepted as Mastocarpus stellatus (Stackhouse) Guiry, 1984
128. Species Gigartina cornucopiae (Postels & Ruprecht) D.H.Kim, 1976 accepted as Mazzaella laminarioides (Bory) Fredericq, 1993
129. Species Gigartina corymbifera (Kützing) J.Agardh, 1876 accepted as Chondracanthus corymbiferus (Kützing) Guiry, 1993
130. Species Gigartina crassicaulis (C.Agardh) Setchell & N.L.Gardner, 1933 accepted as Sarcothalia crassifolia (C.Agardh) Edyvane & Womersley, 1994
131. Species Gigartina crassifolia (C.Agardh) J.Agardh, 1842 accepted as Sarcothalia crassifolia (C.Agardh) Edyvane & Womersley, 1994
132. Species Gigartina crispata (Bory de Saint-Vincent) D.H.Kim, 1976 accepted as Sarcothalia crispata (Bory de Saint-Vincent) Leister, 1993 (synonym)
133. Species Gigartina cristata (Setchell) Setchell & N.L.Gardner, 1933 accepted as Mastocarpus cristatus (Setchell) S.C.Lindstrom, Hughey & Martone, 2011 (synonym)
134. Species Gigartina decipiens (J.D.Hooker & Harvey) J.D.Hooker & Harvey, 1855 accepted as Sarcothalia decipiens (J.D.Hooker & Harvey) Hommersand, 1993 (synonym)
135. Species Gigartina dentata (Kützing) D.H.Kim, 1976 accepted as Sarcothalia dichotoma (J.D.Hooker & Harvey) Leister, 1993 (synonym)
136. Species Gigartina denticulata (E.Y.Dawson, Acleto & Foldvik) D.H.Kim, 1976 accepted as Mazzaella denticulata (E.Y.Dawson, Acleto & Foldvik) Fredericq, 1993 (synonym)
137. Species Gigartina denudata Bory, 1832 accepted as Alsidium corallinum C.Agardh, 1827
138. Species Gigartina dichotoma N.L.Gardner, 1927 accepted as Mastocarpus latissimus (Harvey) S.C.Lindstrom, Hughey & Martone, 2011 (synonym)
139. Species Gigartina diffusa (E.Y.Dawson) D.H.Kim, 1976 accepted as Mazzaella diffusa (E.Y.Dawson) J.N.Norris & Fredericq, 2014
140. Species Gigartina digitata (E.Y.Dawson) D.H.Kim, 1976 accepted as Mazzaella digitata (E.Y.Dawson) J.N.Norris & Fredericq, 2014 (synonym)
141. Species Gigartina dura (C.Agardh) Desmazières, 1830 accepted as Gracilaria dura (C.Agardh) J.Agardh, 1842 (synonym)
142. Species Gigartina eatoniana J.Agardh, 1899 accepted as Chondracanthus spinosus (Kützing) Guiry, 1993
143. Species Gigartina echinata N.L.Gardner, 1927 accepted as Chondracanthus spinosus (Kützing) Guiry, 1993 (synonym)
144. Species Gigartina ehinata N.L.Gardner, 1927 accepted as Chondracanthus spinosus (Kützing) Guiry, 1993
145. Species Gigartina elata (Holmes) D.H.Kim, 1976 accepted as Chondrus elatus Holmes, 1896
146. Species Gigartina elegans Greville, 1833 accepted as Chondracanthus elegans (Greville) Guiry, 1993
147. Species Gigartina exasperata Harvey & Bailey, 1851 accepted as Chondracanthus exasperatus (Harvey & Bailey) Hughey, 1996
148. Species Gigartina expansa D.H.Kim, 1976 accepted as Iridaea latissima (J.D.Hooker & Harvey) Grunow, 1867
149. Species Gigartina explanata (Suhr) D.H.Kim, 1976 accepted as Iridaea explanata Suhr, 1841 (synonym)
150. Species Gigartina fabriciana Lyngbye, 1819 accepted as Membranoptera fabriciana (Lyngbye) M.J.Wynne & G.W.Saunders, 2012 (synonym)
151. Species Gigartina falcata J.Agardh, 1851 accepted as Chondracanthus acicularis (Roth) Fredericq, 1993
152. Species Gigartina farlowiana J.Agardh, 1899 accepted as Chondracanthus spinosus (Kützing) Guiry, 1993 (synonym)
153. Species Gigartina fastigiata Postels & Ruprecht, 1840 accepted as Ahnfeltia fastigiata (Endlicher) Makienko, 1970
154. Species Gigartina fastigiata J.Agardh, 1849 accepted as Sarcothalia scutellata (Hering) Leister, 1993
155. Species Gigartina flabellata J.Agardh, 1851 accepted as Gigartina muelleriana Setchell & N.L.Gardner, 1933
156. Species Gigartina flaccida (Setchell & N.L.Gardner) D.H.Kim, 1976 accepted as Mazzaella flaccida (Setchell & N.L.Gardner) Fredericq, 1993 (synonym)
157. Species Gigartina flagelliformis (Sonder) Sonder, 1848 accepted as Gracilaria flagelliformis (Sonder) Womersley, 1996
158. Species Gigartina foliifera (Harvey) D.H.Kim, 1976 accepted as Halopeltis australis (J.Agardh) G.W.Saunders, 2010 (synonym)
159. Species Gigartina gaditana Montagne, 1839 accepted as Solieria chordalis (C.Agardh) J.Agardh, 1842
160. Species Gigartina gaudichaudii Montagne, 1842 accepted as Sarcodiotheca gaudichaudii (Montagne) P.W.Gabrielson, 1982
161. Species Gigartina gelidium (J.Agardh) Endlicher, 1843 accepted as Meristotheca gelidium (J.Agardh) E.J.Faye & M.Masuda, 2004
162. Species Gigartina gigantea J.Agardh, 1885 accepted as Sarcothalia radula (Esper) Edyvane & Womersley, 1994
163. Species Gigartina glomerata M.A.Howe, 1914 accepted as Chondracanthus glomeratus (Howe) Guiry, 1993
164. Species Gigartina grandifolia J.Agardh, 1899 accepted as Gigartina circumcincta J.Agardh, 1876 accepted as Sarcothalia circumcincta (J.Agardh) Hommersand, 1993
165. Species Gigartina griffithsii (Turner) J.V.Lamouroux, 1813 accepted as Gymnogongrus griffithsiae (Turner) C.Martius, 1833
166. Species Gigartina hancockii (E.Y.Dawson) D.H.Kim, 1976 accepted as Mazzaella hancockii (E.Y.Dawson) Fredericq, 1993 (synonym)
167. Species Gigartina harveyana (Kützing) Setchell & N.L.Gardner, 1933 accepted as Chondracanthus harveyanus (Kützing) Guiry, 1993
168. Species Gigartina hemisphaerica (Mikami) D.H.Kim, 1976 accepted as Mazzaella hemisphaerica (Mikami) Yoshida, 1997
169. Species Gigartina heterocarpa (Postels & Ruprecht) D.H.Kim, 1976 accepted as Chondrus crispus Stackhouse, 1797 (synonym)
170. Species Gigartina horrida (C.Agardh) Greville, 1830 accepted as Endosiphonia horrida (C.Agardh) P.C.Silva, 1996
171. Species Gigartina insidiosa J.Agardh, 1899 accepted as Sarcothalia insidiosa (J.Agardh) Edyvane & Womersley, 1994
172. Species Gigartina intermedia Suringar, 1867 accepted as Chondracanthus intermedius (Suringar) Hommersand, 1993
173. Species Gigartina inubozakiensis P.G.Parkinson, 1981 accepted as Chondrus verrucosus Mikami, 1965
174. Species Gigartina irregularis D.H.Kim, 1976 accepted as Rhodoglossum gigartinoides (Sonder) Edyvane & Womersley, 1993 (synonym)
175. Species Gigartina isiforme (C.Agardh) Endlicher, 1843 accepted as Eucheuma isiforme (C.Agardh) J.Agardh, 1847 accepted as Eucheumatopsis isiformis (C.Agardh) Núñez-Resendiz, Dreckmann & Sentíes, 2019
176. Species Gigartina isiformis (C.Agardh) Greville, 1830 accepted as Eucheumatopsis isiformis (C.Agardh) Núñez-Resendiz, Dreckmann & Sentíes, 2019
177. Species Gigartina japonica (Mikami) D.H.Kim, 1976 accepted as Mazzaella japonica (Mikami) Hommersand, 1993
178. Species Gigartina jardinii J.Agardh, 1872 accepted as Mastocarpus jardinii (J.Agardh) J.A.West, 1984
179. Species Gigartina johnstonii E.Y.Dawson, 1944 accepted as Chondracanthus squarrulosus (Setchell & N.L.Gardner) Hughey, P.C.Silva & Hommersand, 2001
180. Species Gigartina julacea Bory de Saint-Vincent accepted as Chondrophycus papillosus (C.Agardh) D.J.Garbary & J.T.Harper, 1998 accepted as Palisada perforata (Bory) K.W.Nam, 2007
181. Species Gigartina klenzeana (Kützing) Sonder, 1854 accepted as Sarcodia montagneana (J.D.Hooker & Harvey) J.Agardh, 1852
182. Species Gigartina kuetzingii Setchell & Gardner, 1933 (unaccepted, synonym)
183. Species Gigartina laminarioides (Bory de Saint-Vincent) D.H.Kim, 1976 (unaccepted, synonym)
184. Species Gigartina lanceata J.Agardh, 1899 (unaccepted)
185. Species Gigartina lanceolata Harvey, 1860 (unaccepted)
186. Species Gigartina lancifolia Harvey, 1860 (unaccepted)
187. Species Gigartina lanecata J.Agardh ex Wilson, 1892 (unaccepted)
188. Species Gigartina latissima (Harvey) Eaton, 1899 (unaccepted, synonym)
189. Species Gigartina lemaneiformis Bory de Saint-Vincent, 1828 (unaccepted)
190. Species Gigartina leptorhynchos J.Agardh, 1885 (unaccepted)
191. Species Gigartina lichenoides J.V.Lamouroux, 1813 (unaccepted)
192. Species Gigartina linearis (Setchell & N.L.Gardner) D.H.Kim, 1976 (unaccepted, synonym)
193. Species Gigartina livida (Turner) J.Agardh, 1842 (unaccepted)
194. Species Gigartina longifolia J.Agardh, 1899 (unaccepted, synonym)
195. Species Gigartina longipes Kützing, 1859 (unaccepted)
196. Species Gigartina lubrica Lyngbye, 1819 (unaccepted)
197. Species Gigartina lycopodioides (Linnaeus) Lyngbye, 1819 (unaccepted)
198. Species Gigartina macdougalii E.Y.Dawson, 1944 (unaccepted)
199. Species Gigartina macrodonta (Skottsberg) D.H.Kim, 1976 (unaccepted, synonym)
200. Species Gigartina mammillosa (Goodenough & Woodward) J.Agardh, 1851 (unaccepted, synonym)
201. Species Gigartina marginifera J.Agardh, 1876 (unaccepted)
202. Species Gigartina mawsonii (A.H.S.Lucas) D.H.Kim, 1976 (unaccepted, synonym)
203. Species Gigartina membranacea (J.Agardh) D.H.Kim, 1976 (unaccepted, synonym)
204. Species Gigartina micans (Bory de Saint-Vincent) D.H.Kim, 1976 (unaccepted, synonym)
205. Species Gigartina micrococca (Kützing) D.H.Kim, 1976 (unaccepted, synonym)
206. Species Gigartina microphylla (Harvey) Harvey, 1853 (unaccepted, synonym)
207. Species Gigartina mikamii Yoshida, 1976 (unaccepted)
208. Species Gigartina miniata Duby, 1830 (unaccepted)
209. Species Gigartina mollis Harvey & Bailey, 1851 (unaccepted)
210. Species Gigartina montereiensis P.G.Parkinson, 1981 (unaccepted, synonym)
211. Species Gigartina muricata (S.G.Gmelin) J.V.Lamouroux, 1813 (unaccepted)
212. Species Gigartina muricata Postels & Ruprecht, 1840 (unaccepted)
213. Species Gigartina nitens J.Agardh, 1899 (unaccepted)
214. Species Gigartina nodifera (Hering) Hering, 1846 (unaccepted)
215. Species Gigartina obovata J.Agardh, 1899 (unaccepted, synonym)
216. Species Gigartina obtusa Greville ex J.Agardh, 1852 (unaccepted)
217. Species Gigartina obtusifolia (E.S.Sinova) D.H.Kim, 1976 (unaccepted, synonym)
218. Species Gigartina ochotensis (Ruprecht) Yendo, 1916 (unaccepted)
219. Species Gigartina orbicularis Zanardini, 1874 (unaccepted)
220. Species Gigartina ornata Sonder ex Kützing, 1868 (unaccepted)
221. Species Gigartina ornithorhynchos J.Agardh, 1849 (unaccepted)
222. Species Gigartina ovata J.V.Lamouroux, 1813 (unaccepted)
223. Species Gigartina oweniae (Hollenberg & I.A.Abbott) D.H.Kim, 1976 (unaccepted, synonym)
224. Species Gigartina pacifica Kjellman, 1889 (unaccepted)
225. Species Gigartina papillata (C.Agardh) J.Agardh, 1846 (unaccepted)
226. Species Gigartina papillosa (Bory de Saint-Vincent) Stechell & N.L.Gardner, 1936 (unaccepted)
227. Species Gigartina pectinata E.Y.Dawson, 1944 (unaccepted)
228. Species Gigartina phyllocarpa (Postels & Ruprecht) D.H.Kim, 1976 (unaccepted)
229. Species Gigartina pinastroides Lyngbye, 1819 (unaccepted)
230. Species Gigartina plicata (Hudson) J.V.Lamouroux (unaccepted)
231. Species Gigartina polyglotta J.Agardh, 1885 (unaccepted, synonym)
232. Species Gigartina prolifera Hariot, 1891 (unaccepted)
233. Species Gigartina prolifera (J.Agardh) D.H.Kim, 1976 (unaccepted)
234. Species Gigartina prolifica Kützing, 1869 (unaccepted, synonym)
235. Species Gigartina protea J.Agardh, 1885 (unaccepted, synonym)
236. Species Gigartina pulchra (Kützing) Kim, 1976 (unaccepted)
237. Species Gigartina punicea (Postels & Ruprecht) D.H.Kim, 1976 (unaccepted, synonym)
238. Species Gigartina purpurascens (Hudson) J.V.Lamouroux, 1813 (unaccepted)
239. Species Gigartina purpurea (J.Agardh) D.H.Kim, 1976 (unaccepted, synonym)
240. Species Gigartina pygmaea J.V.Lamouroux, 1813 (unaccepted)
241. Species Gigartina radula (Esper) J.Agardh, 1851 (unaccepted, synonym)
242. Species Gigartina revoluta (Baardseth) D.H.Kim, 1976 (unaccepted, synonym)
243. Species Gigartina rosea (Kylin) D.H.Kim, 1976 (unaccepted, synonym)
244. Species Gigartina rugulosa (Bory de Saint-Vincent) Bory de Saint-Vincent, 1828 (unaccepted)
245. Species Gigartina ruprechtiana (E.S.Sinova) D.H.Kim, 1976 (unaccepted, synonym)
246. Species Gigartina scutellata (Hering) Simons, 1983 (unaccepted, synonym)
247. Species Gigartina serra (J.Agardh) Endlicher (unaccepted)
248. Species Gigartina serrata N.L.Gardner, 1927 (unaccepted)
249. Species Gigartina simplex D.H.Kim, 1976 (unaccepted)
250. Species Gigartina sinposa (Kützing) Harvey, 1853 (unaccepted)
251. Species Gigartina sitchensis (Ruprecht) Yendo, 1916 (unaccepted)
252. Species Gigartina skottsbergi Setchell & N.L. Gardner (unaccepted)
253. Species Gigartina speciosa Sonder, 1845 (unaccepted)
254. Species Gigartina spinella (C.Agardh) Greville, 1830 (unaccepted)
255. Species Gigartina spinosa (Kützing) Harvey, 1853 (unaccepted)
256. Species Gigartina spinosa Greville, 1830 (unaccepted)
257. Species Gigartina stellata (Stackhouse) Batters, 1902 (unaccepted, synonym)
258. Species Gigartina stiriata (Turner) J.Agardh, 1851 (unaccepted)
259. Species Gigartina subfusca (Woodward) J.V.Lamouroux, 1813 (unaccepted)
260. Species Gigartina subulata (C.Agardh) Greville, 1830 (unaccepted, synonym)
261. Species Gigartina teedei (Mertens ex Roth) J.V.Lamouroux, 1813 (unaccepted, synonym)
262. Species Gigartina tenella Harvey, 1860 (unaccepted)
263. Species Gigartina tenera J.Agardh, 1841 (unaccepted)
264. Species Gigartina tepida Hollenberg, 1945 (unaccepted)
265. Species Gigartina torulosa J.D.Hooker & Harvey, 1845 (unaccepted)
266. Species Gigartina tristis J.V.Lamouroux, 1822 (unaccepted)
267. Species Gigartina tuberculosa (J.D.Hooker & Harvey) Grunow, 1886 (unaccepted)
268. Species Gigartina unalaschcensis (Ruprecht) J.Agardh, 1899 (unaccepted)
269. Species Gigartina undulosa (Bory de Saint-Vincent) D.H.Kim, 1976 (unaccepted, synonym)
270. Species Gigartina urvillei J.V.Lamouroux, 1822 (unaccepted)
271. Species Gigartina ustulata (Mertens ex Turner) Greville, 1830 (unaccepted)
272. Species Gigartina uvaria (J.A.Murray) J.V.Lamouroux, 1813 (unaccepted, synonym)
273. Species Gigartina velifera J.Agardh, 1899 (unaccepted)
274. Species Gigartina verrucosa D.H.Kim, 1976 (unaccepted)
275. Species Gigartina viridis (O.F.Müller) Lyngbye, 1819 (unaccepted)
276. Species Gigartina volans (C.Agardh) J.Agardh, 1846 (unaccepted)
277. Species Gigartina wiggii (Turner) S.F.Gray, 1821 (unaccepted)
278. Species Gigartina aculeifera Setchell & N.L.Gardner (uncertain)
279. Species Gigartina acuminata Schousboe (uncertain)
280. Species Gigartina americana (J.Agardh) Kim, 1976 (uncertain)
281. Species Gigartina asparagoides (Woodward) S.F.Gray (uncertain)
282. Species Gigartina australis J.Agardh, 1899 (uncertain)
283. Species Gigartina burmanni (C.Agardh) J.Agardh (uncertain)
284. Species Gigartina capillaris (Turner) J.V.Lamouroux (uncertain)
285. Species Gigartina caudata Schousboe (uncertain)
286. Species Gigartina concinna (Turner) Greville (uncertain)
287. Species Gigartina corniculata (Turner) Endlicher (uncertain)
288. Species Gigartina cranwellae Laing ex V.J.Chapman (uncertain)
289. Species Gigartina dasyphylla (Turner) J.V.Lamouroux (uncertain)
290. Species Gigartina erecta (Greville) Hooker (uncertain)
291. Species Gigartina filiformis Kützing (uncertain)
292. Species Gigartina franciscana N.L.Gardner (uncertain)
293. Species Gigartina glandulosa (Turner) J.V.Lamouroux (uncertain)
294. Species Gigartina incrassata (Kützing) Setchell & Gardner (uncertain)
295. Species Gigartina laeflingii Stackhouse (uncertain)
296. Species Gigartina marginalis J.V.Lamouroux (uncertain)
297. Species Gigartina opuntia (Turner) J.V.Lamouroux (uncertain)
298. Species Gigartina pedunculata (Turner) Lamouroux (uncertain)
299. Species Gigartina polyacantha Montagne, 1849 (uncertain)
300. Species Gigartina praetercincta Laing & Gourlay, 1979 (uncertain, uncertain taxonomic status subjected to verification)
301. Species Gigartina pumila Zanardini, 1874 (uncertain)
302. Species Gigartina ramosissima Schousboe (uncertain)
303. Species Gigartina rubra Sonder (uncertain)
304. Species Gigartina scoparia Schousboe (uncertain)
305. Species Gigartina scorpioides (Fl.Dan.) J.V.Lamouroux (uncertain)
306. Species Gigartina spathulata J.Agardh (uncertain)
307. Species Gigartina tenax (Turner) Lamouroux (uncertain)
308. Species Gigartina tingitana Schousboe (uncertain)
309. Species Gigartina turneri Setchell & N.L.Gardner, 1933 (uncertain)
310. Species Gigartina turneri S.F.Gray, 1821 (uncertain)
311. Species Gigartina vermicularis (Gmelin) Lamouroux (uncertain)
312. Species Gigartina wrightii (Turner) Lamouroux (uncertain)

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