1. Species Delesseria aemula A.J.K.Millar & M.J.Wynne, 1992
2. Species Delesseria appendiculata Mazza ex De Toni, 1924
3. Species Delesseria bartoniae F.Schmitz
4. Species Delesseria bifida (Turner) J.V.Lamouroux
5. Species Delesseria botryocarpa J.V.Lamouroux
6. Species Delesseria bracteata (Turner) J.V.Lamouroux
7. Species Delesseria caulescens (S.G.Gmelin) J.V.Lamouroux
8. Species Delesseria crispa Sonder
9. Species Delesseria dentata (Turner) J.V.Lamouroux
10. Species Delesseria ferrarii Bonnemaison & J.V.Lamouroux
11. Species Delesseria griffithsiana Suhr
12. Species Delesseria hypoglossa (Turner) J.V.Lamouroux
13. Species Delesseria intermedia J.Agardh, 1872
14. Species Delesseria oppositifolia Harvey
15. Species Delesseria opuntioides J.Agardh, 1854
16. Species Delesseria pleurospora Harvey
17. Species Delesseria pontica K.N.Deckenbach
18. Species Delesseria sanguinea (Hudson) J.V.Lamouroux, 1813
19. Species Delesseria spermophora (Turner) J.V.Lamouroux
20. Species Delesseria spinulosa (Ruprecht) J.Agardh
21. Species Delesseria subdichotoma J.Agardh
22. Subgenus Delesseria subg. Erythroglossum
23. Subgenus Delesseria subg. Paraglossum
24. Species Delesseria subtilis Grunow, 1889
25. Species Delesseria ulvoides (Turner) C.Agardh
26. Species Delesseria vieillardii (Kützing) Zanardini
27. Species Delesseria adnata Zanardini, 1872 accepted as Caloglossa bengalensis (G.Martens) R.J.King & Puttock, 1994
28. Species Delesseria alata (Hudson) J.V.Lamouroux, 1813 accepted as Membranoptera alata (Hudson) Stackhouse, 1809 (synonym)
29. Species Delesseria amansioides Sonder, 1853 accepted as Phitymophora amansioides (Sonder) Womersley, 1965
30. Species Delesseria amboinensis Karsten, 1891 accepted as Caloglossa beccarii (Zanardini) De Toni, 1900
31. Species Delesseria americana C.Agardh, 1822 accepted as Grinnellia americana (C.Agardh) Harvey, 1853
32. Species Delesseria angustissima (Turner) A.W.Griffiths ex Harvey, 1847 accepted as Membranoptera carpophylla (Kützing) Athanasiadis, 2016
33. Species Delesseria antarctica Skottsberg, 1919 accepted as Phycodrys antarctica (Skottsberg) Skottsberg, 1923
34. Species Delesseria armata J.Agardh, 1894 accepted as Hypoglossum armatum (J.Agardh) J.Agardh, 1898
35. Species Delesseria baeri Ruprecht, 1850 accepted as Pantoneura fabriciana (Lyngbye) M.J.Wynne, 1997 accepted as Membranoptera fabriciana (Lyngbye) M.J.Wynne & G.W.Saunders, 2012
36. Species Delesseria balayevii A.D.Zinova, 1963 accepted as Delesseria lancifolia J.Agardh, 1872 accepted as Paraglossum lancifolium (J.Agardh) J.Agardh, 1898
37. Species Delesseria balearica J.J.Rodríguez y Femenías, 1898 accepted as Erythroglossum balearicum J.Agardh ex Kylin, 1924 (synonym)
38. Species Delesseria beccarii Zanardini, 1872 accepted as Caloglossa beccarii (Zanardini) De Toni, 1900
39. Species Delesseria belayevii A.D.Zinova, 1963 accepted as Delesseria lancifolia J.Agardh, 1872 accepted as Paraglossum lancifolium (J.Agardh) J.Agardh, 1898 (deleted in Algaebase)
40. Species Delesseria bengalensis (G.Martens) Prain, 1905 accepted as Caloglossa bengalensis (G.Martens) R.J.King & Puttock, 1994
41. Species Delesseria beringiana Ruprecht, 1850 accepted as Membranoptera spinulosa (Ruprecht) Kuntze, 1891
42. Species Delesseria bipinnatifida Montagne, 1837 accepted as Branchioglossum bipinnatifidum (Montagne) M.J.Wynne, 1983
43. Species Delesseria bonnemaisonii C.Agardh, 1822 accepted as Polyneura bonnemaisonii (C.Agardh) Maggs & Hommersand, 1993
44. Species Delesseria botryocarpa C.Agardh accepted as Botryocarpa prolifera Greville, 1830 (synonym)
45. Species Delesseria brodiaei (Turner) J.V.Lamouroux, 1813 accepted as Coccotylus brodiei (Turner) Kützing, 1843
46. Species Delesseria californica J.Agardh, 1884 accepted as Erythroglossum californicum (J.Agardh) J.Agardh, 1898
47. Species Delesseria carnosa Reinsch, 1888 accepted as Microrhinus carnosus (Reinsch) Skottsberg, 1923
48. Species Delesseria chordalis C.Agardh, 1822 accepted as Solieria chordalis (C.Agardh) J.Agardh, 1842
49. Species Delesseria coccinea (Hudson) C.Agardh, 1817 accepted as Plocamium cartilagineum (Linnaeus) P.S.Dixon, 1967
50. Species Delesseria commandorensis E.S.Sinova, 1940 accepted as Yendonia crassifolia (Ruprecht) Kylin, 1935 (synonym)
51. Species Delesseria condensata Reinsch, 1888 accepted as Schizoseris condensata (Reinsch) R.W.Ricker, 1987
52. Species Delesseria conferta (R.Brown ex Turner) C.Agardh, 1822 accepted as Leptophyllis conferta (R.Brown ex Turner) J.Agardh, 1876 (synonym)
53. Species Delesseria coriifolia Harvey, 1855 accepted as Chauviniella coriifolia (Harvey) Papenfuss, 1956
54. Species Delesseria cornea (Hudson) Greville, 1828 accepted as Gelidium corneum (Hudson) J.V.Lamouroux, 1813
55. Species Delesseria corymbosa J.Agardh, 1852 accepted as Pantoneura fabriciana (Lyngbye) M.J.Wynne, 1997 accepted as Membranoptera fabriciana (Lyngbye) M.J.Wynne & G.W.Saunders, 2012
56. Species Delesseria crassifolia Ruprecht, 1850 accepted as Yendonia crassifolia (Ruprecht) Kylin, 1935
57. Species Delesseria crassinervia Montagne, 1842 accepted as Paraglossum crassinervium (Montagne) S.-M.Lin, Fredericq & Hommersand, 2012
58. Species Delesseria crenata (S.G.Gmelin) Ruprecht, 1850 accepted as Phycodrys rubens (Linnaeus) Batters, 1902
59. Species Delesseria crispa (Zanardini) Zanardini, 1843 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917
60. Species Delesseria crispatula Harvey, 1855 accepted as Dicroglossum crispatulum (Harvey) A.J.K.Millar & Huisman, 1996
61. Species Delesseria crozetii Levring, 1944 accepted as Paraglossum crozetii (Levring) S.-M.Lin & Hommersand, 2016
62. Species Delesseria davisii J.D.Hooker & Harvey, 1845 accepted as Schizoseris griffithsia (Suhr) M.J.Wynne, 1989
63. Species Delesseria decipiens J.Agardh, 1872 accepted as Cumathamnion decipiens (J.Agardh) M.J.Wynne & G.W.Saunders, 2012 (synonym)
64. Species Delesseria dendroides Harvey, 1855 accepted as Hypoglossum dendroides (Harvey) J.Agardh, 1898
65. Species Delesseria denticulata Harvey, 1855 accepted as Heterodoxia denticulata (Kuntze) J.Agardh, 1898
66. Species Delesseria denticulata J.Agardh, 1894 accepted as Hypoglossum revolutum (Harvey) J.Agardh, 1898 (synonym)
67. Species Delesseria denticulata (Montagne) Montagne, 1849 accepted as Membranoptera spinulosa (Ruprecht) Kuntze, 1891
68. Species Delesseria dichotoma J.D.Hooker & Harvey, 1845 accepted as Schizoseris dichotoma (J.D.Hooker & Harvey) Kylin, 1924
69. Species Delesseria endiviaefolia J.D.Hooker & Harvey, 1847 accepted as Hymenena endiviifolia (J.D.Hooker & Harvey) Womersley, 2003
70. Species Delesseria endiviifolia Hooker f. & Harvey, 1847 accepted as Hymenena endiviifolia (J.D.Hooker & Harvey) Womersley, 2003
71. Species Delesseria epiglossum J.Agardh, 1876 accepted as Paraglossum epiglossum (J.Agardh) J.Agardh, 1898
72. Species Delesseria erinacea (Turner) J.V.Lamouroux, 1813 accepted as Nothogenia erinacea (Turner) P.G.Parkinson, 1983
73. Species Delesseria ferlusii Hariot, 1902 accepted as Duckerella ferlusii (Hariot) M.J.Wynne, 1982
74. Species Delesseria filicina J.V.Lamouroux, 1813 accepted as Grateloupia filicina (J.V.Lamouroux) C.Agardh, 1822
75. Species Delesseria fimbriata J.V.Lamouroux, 1813 accepted as Osmundaria fimbriata (J.V.Lamouroux) R.E.Norris, 1991
76. Species Delesseria fimbriata Bachelot de la Pylaie ex J.Agardh, 1852 accepted as Phycodrys fimbriata (Kuntze) Kylin, 1924
77. Species Delesseria flaccida J.V.Lamouroux, 1813 accepted as Carpoblepharis flaccida (J.V.Lamouroux) Kützing, 1849
78. Species Delesseria fraxinifolia (Mertens ex Turner) C.Agardh, 1817 accepted as Neurymenia fraxinifolia (Mertens ex Turner) J.Agardh, 1863
79. Species Delesseria frondosa Hooker f. & Harvey, 1847 accepted as Hemineura frondosa (J.D.Hooker & Harvey) Harvey, 1849
80. Species Delesseria fuegiensis Skottsberg, 1923 accepted as Paraglossum fuegiense (Skottsberg) S.-M.Lin, Fredericq & Hommersand, 2012
81. Species Delesseria glandulosa (Solander ex Turner) C.Agardh, 1822 accepted as Ceramium glandulosum (Solander ex Turner) Barros-Barreto & Maggs, 2023
82. Species Delesseria gmelinii J.V.Lamouroux, 1813 accepted as Erythroglossum laciniatum (Lightfoot) Maggs & Hommersand, 1993
83. Species Delesseria griffithsia Suhr, 1840 accepted as Schizoseris griffithsia (Suhr) M.J.Wynne, 1989
84. Species Delesseria hancockii W.R.Taylor, 1945 accepted as Paraglossum hancockii (W.R.Taylor) M.J.Wynne, 2014
85. Species Delesseria harveyana J.Agardh, 1872 accepted as Hypoglossum harveyanum (J.Agardh) Womersley & Shepley, 1982
86. Species Delesseria heterocystidea J.Agardh, 1885 accepted as Hypoglossum heterocystideum (J.Agardh) J.Agardh, 1898
87. Species Delesseria hilliae Greville, 1828 accepted as Polyneura bonnemaisonii (C.Agardh) Maggs & Hommersand, 1993
88. Species Delesseria holmiana Strömfelt, 1887 accepted as Membranoptera denticulata (Montagne) Kylin, 1924 accepted as Membranoptera spinulosa (Ruprecht) Kuntze, 1891
89. Species Delesseria hookeri Lyall ex Harvey, 1855 accepted as Laingia hookeri (Lyall ex Harvey) Kylin, 1929
90. Species Delesseria hypoglossoides Harvey, 1855 accepted as Hypoglossum heterocystideum (J.Agardh) J.Agardh, 1898
91. Species Delesseria hypoglossum (Woodward) J.V.Lamouroux, 1813 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917
92. Species Delesseria imbricata Areschoug, 1854 accepted as Phitymophora amansioides (Sonder) Womersley, 1965
93. Species Delesseria interrupta C.Agardh, 1822 accepted as Stenogramma interruptum (C.Agardh) Montagne, 1846
94. Species Delesseria involvens Harvey, 1853 accepted as Hypoglossum involvens (Harvey) J.Agardh, 1898 (synonym)
95. Species Delesseria kurilensis Ruprecht, 1850 accepted as Congregatocarpus kurilensis (Ruprecht) M.J.Wynne, 2005
96. Species Delesseria lacera J.V.Lamouroux, 1813 accepted as Palmaria palmata (Linnaeus) F.Weber & D.Mohr, 1805
97. Species Delesseria lacerata (S.G.Gmelin) C.Agardh, 1822 accepted as Cryptopleura ramosa (Hudson) L.Newton, 1931
98. Species Delesseria laciniata Kützing, 1866 accepted as Schizoseris condensata (Reinsch) R.W.Ricker, 1987
99. Species Delesseria lancifolia J.Agardh, 1872 accepted as Paraglossum lancifolium (J.Agardh) J.Agardh, 1898
100. Species Delesseria larsenii Skottsberg, 1919 accepted as Paraglossum larsenii (Skottsberg) S.-M.Lin, Fredericq & Hommersand, 2012
101. Species Delesseria laurifolia (J.Agardh) Kylin, 1924 accepted as Paraglossum nereifolium (Harvey) S.-M.Lin, Fredericq & Hommersand, 2012
102. Species Delesseria leprieurii Montagne, 1840 accepted as Caloglossa leprieurii (Montagne) G.Martens, 1869
103. Species Delesseria ligulata Reinsch, 1888 accepted as Neuroglossum delesseriae (Reinsch) M.J.Wynne, 1997
104. Species Delesseria ligulata S.F.Gray, 1821 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917
105. Species Delesseria linearis Laing, 1897 accepted as Phitymophora linearis (Laing) Kylin, 1924
106. Species Delesseria lingulata Duby, 1830 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917
107. Species Delesseria lomentacea Zanardini, 1864 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917
108. Species Delesseria lyallii Hooker f. & Harvey, 1845 accepted as Cladodonta lyallii (J.D.Hooker & Harvey) Skottsberg, 1923
109. Species Delesseria macloviana Skottsberg, 1919 accepted as Paraglossum maclovianum (Skottsberg) S.-M.Lin & Hommersand, 2016
110. Species Delesseria marginifera J.Agardh, 1885 accepted as Crassilingua marginifera (J.Agardh) Papenfuss, 1958
111. Species Delesseria microdonthum J.Agardh, 1898 accepted as Hypoglossum armatum (J.Agardh) J.Agardh, 1898
112. Species Delesseria middendorffii Ruprecht, 1850 accepted as Neohypophyllum middendorffii (Ruprecht) M.J.Wynne, 1983
113. Species Delesseria minor Baardseth, 1941 accepted as Paraglossum minus (Baardseth) S.-M.Lin & Hommersand, 2016
114. Species Delesseria montagneana J.Agardh, 1876 accepted as Apoglossum montagneanum (J.Agardh) J.Agardh, 1898
115. Species Delesseria montagnei Kjellman, 1883 accepted as Membranoptera denticulata (Montagne) Kylin, 1924 accepted as Membranoptera spinulosa (Ruprecht) Kuntze, 1891
116. Species Delesseria nereifolia Harvey, 1855 accepted as Paraglossum nereifolium (Harvey) S.-M.Lin, Fredericq & Hommersand, 2012
117. Species Delesseria nervosa (A.P.de Candolle) J.V.Lamouroux, 1813 accepted as Phyllophora crispa (Hudson) P.S.Dixon, 1964 (synonym)
118. Species Delesseria ocellata (J.V.Lamouroux) J.V.Lamouroux, 1813 accepted as Nitophyllum punctatum (Stackhouse) Greville, 1830
119. Species Delesseria oppositifolium Harvey, 1855 accepted as Apoglossum oppositifolium (Harvey) J.Agardh, 1898
120. Species Delesseria ovifolia Kützing, 1866 accepted as Phycodrys ovifolia (Kützing) M.J.Wynne, 1989
121. Species Delesseria palmata (Linnaeus) J.V.Lamouroux, 1813 accepted as Palmaria palmata (Linnaeus) F.Weber & D.Mohr, 1805
122. Species Delesseria palmetta (Stackhouse) J.V.Lamouroux, 1813 accepted as Rhodymenia pseudopalmata (J.V.Lamouroux) P.C.Silva, 1952
123. Species Delesseria papenfussii M.J.Wynne, 1984 accepted as Paraglossum papenfussii (M.J.Wynne) S.-M.Lin, Fredericq & Hommersand, 2012
124. Species Delesseria penicillata Zanardini, 1861 accepted as Hypoglossum hypoglossoides (Stackhouse) Collins & Hervey, 1917
125. Species Delesseria peruviana Montagne, 1837 accepted as Nitophyllum peruvianum (Montagne) M.Howe, 1914
126. Species Delesseria phylloloma Montagne, 1837 (unaccepted)
127. Species Delesseria phyllophora J.Agardh, 1872 (unaccepted)
128. Species Delesseria platycarpa (Turner) J.V.Lamouroux, 1813 (unaccepted)
129. Species Delesseria plocamium C.Agardh, 1822 (unaccepted)
130. Species Delesseria polydactyla Reinsch, 1888 (unaccepted)
131. Species Delesseria pristoides (Turner) J.V.Lamouroux, 1813 (unaccepted)
132. Species Delesseria propinqua J.Agardh, 1855 (unaccepted)
133. Species Delesseria protendens J.Agardh, 1894 (unaccepted)
134. Species Delesseria pseudopalmata (J.V.Lamouroux) J.V.Lamouroux, 1813 (unaccepted)
135. Species Delesseria punctata (Stackhouse) C.Agardh, 1822 (unaccepted)
136. Species Delesseria pygmaea (G.Martens) Prain, 1905 (unaccepted)
137. Species Delesseria quercifolia Bory de Saint-Vincent, 1825 (unaccepted)
138. Species Delesseria radicosa Okamura, 1896 (unaccepted)
139. Species Delesseria ramentacea C.Agardh, 1822 (unaccepted)
140. Species Delesseria revoluta Harvey, 1855 (unaccepted)
141. Species Delesseria rhodantha Harvey, 1834 (unaccepted)
142. Species Delesseria rigida Kützing, 1869 (unaccepted)
143. Species Delesseria rossica E.S.Sinova, 1921 (unaccepted)
144. Species Delesseria rostrata (Lyngbye) J.Agardh, 1852 (unaccepted)
145. Species Delesseria rubens (Linnaeus) J.V.Lamouroux, 1813 (unaccepted)
146. Species Delesseria ruscifolia (Turner) J.V.Lamouroux, 1813 (unaccepted, synonym)
147. Species Delesseria salicifolia Reinsch, 1888 (unaccepted)
148. Species Delesseria sandriana Zanardini, 1843 (unaccepted)
149. Species Delesseria schousboei J.Agardh, 1852 (unaccepted)
150. Species Delesseria serrata Postels & Ruprecht, 1840 (unaccepted)
151. Species Delesseria serratodentata Skottsberg, 1919 (unaccepted)
152. Species Delesseria serratula Harvey, 1858 (unaccepted, synonym)
153. Species Delesseria serrulata Harvey, 1857 (unaccepted)
154. Species Delesseria similans J.Agardh, 1872 (unaccepted)
155. Species Delesseria sinuosa J.V.Lamouroux, 1813 (unaccepted, synonym)
156. Species Delesseria sobolifera (M.Vahl) J.V.Lamouroux, 1813 (unaccepted)
157. Species Delesseria spathulata Sonder, 1845 (unaccepted)
158. Species Delesseria spiralis J.V.Lamouroux, 1813 (unaccepted)
159. Species Delesseria stephanocarpa (A.Gepp & E.S.Gepp) Skottsberg, 1941 (unaccepted)
160. Species Delesseria subcostata (J.Agardh) J.Agardh, 1852 (unaccepted)
161. Species Delesseria tasmanica Mueller ex Harvey, 1859 (unaccepted)
162. Species Delesseria tenuifolia Harvey, 1853 (unaccepted)
163. Species Delesseria undulata J.Agardh, 1894 (unaccepted)
164. Species Delesseria uschakovii A.D.Zinova, 1963 (unaccepted)
165. Species Delesseria venosa (Turner) J.V.Lamouroux, 1813 (unaccepted, synonym)
166. Species Delesseria violacea J.Agardh, 1872 (unaccepted, synonym)
167. Species Delesseria woodii J.Agardh, 1872 (unaccepted)
168. Species Delesseria zanzibariensis K.I.Goebel, 1898 (unaccepted)
169. Species Delesseria amethystina Schousboe (uncertain)
170. Species Delesseria ciliaris J.V.Lamouroux (uncertain)
171. Species Delesseria ciliata (Turner) J.V.Lamouroux (uncertain)
172. Species Delesseria complanata Ruprecht, 1850 (uncertain)
173. Species Delesseria corallorhiza Schousboe (uncertain)
174. Species Delesseria cruenta (Harvey) J.Agardh (uncertain)
175. Species Delesseria edulis (Stackhouse) J.V.Lamouroux (uncertain)
176. Species Delesseria hombroniana (Montagne) Ruprecht, 1850 (uncertain)
177. Species Delesseria juergensii (J.Agardh) J.Agardh (uncertain)
178. Species Delesseria lacepedeana Reinbold, 1898 (uncertain)
179. Species Delesseria leiphaemia (Montagne) M.Howe, 1914 (uncertain)
180. Species Delesseria lobata J.V.Lamouroux (uncertain)
181. Species Delesseria membranifolia (Turner) J.V.Lamouroux (uncertain)
182. Species Delesseria minuta Kützing (uncertain)
183. Species Delesseria mnioides Harvey (uncertain)
184. Species Delesseria nana Schousboe (uncertain)
185. Species Delesseria papyracea Schousboe (uncertain)
186. Species Delesseria parisiensis Wat. (uncertain)
187. Species Delesseria pusilla Schousboe (uncertain)
188. Species Delesseria saccata J.V.Lamouroux (uncertain)
189. Species Delesseria stiriata (Turner) J.V.Lamouroux (uncertain)
190. Species Delesseria tenerrima Greville (uncertain)

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