1. Species Mesophyllum aesitante (Conti) Me.Lemoine
2. Species Mesophyllum aleuticum Lebednik, 2004
3. Species Mesophyllum almarae (Me.Lemoine) Me.Lemoine, 1939 †
4. Species Mesophyllum alternans (Foslie) Cabioch & M.L.Mendoza, 1998
5. Species Mesophyllum arakuraense Ishijima, 1954 †
6. Species Mesophyllum biplanum Mastrorilli †
7. Species Mesophyllum brachycladum (Foslie) W.H.Adey, 1970
8. Species Mesophyllum chichibuense Ishijima, 1954 †
9. Species Mesophyllum commune Me.Lemoine, 1939 †
10. Species Mesophyllum conchatum (Setchell & Foslie) W.H.Adey, 1970
11. Species Mesophyllum concretum (M.Howe) Me.Lemoine
12. Species Mesophyllum crassiusculum (Foslie) Lebednik, 2004
13. Species Mesophyllum crenulatum (Foslie) W.H.Adey
14. Species Mesophyllum crispescens (Foslie) Me.Lemoine, 1954
15. Species Mesophyllum curtum Me.Lemoine, 1939 †
16. Species Mesophyllum cystocarpideum (Foslie) W.H.Adey, 1970
17. Species Mesophyllum ectocarpon (Foslie) W.H.Adey, 1970
18. Species Mesophyllum ehrmannii Me.Lemoine, 1939 †
19. Species Mesophyllum engelhartii (Foslie) W.H.Adey, 1970
20. Species Mesophyllum eniwetokense J.H.Johnson
21. Species Mesophyllum exasperatum (Foslie) W.H.Adey, 1970
22. Species Mesophyllum expansum (Philippi) Cabioch & M.L.Mendoza, 2003
23. Species Mesophyllum fluatum W.H.Adey, R.A.Townsend & Boykins, 1982
24. Species Mesophyllum formosanum Ishijima, 1954 †
25. Species Mesophyllum fragilissimum (Foslie) Me.Lemoine, 1928
26. Species Mesophyllum gignouxii Me.Lemoine, 1939
27. Species Mesophyllum haptericola (Foslie) W.H.Adey, 1970
28. Species Mesophyllum hashimotoi Ishijima
29. Species Mesophyllum heteroclitum Me.Lemoine, 1934 †
30. Species Mesophyllum horthocarpum Mastrorilli
31. Species Mesophyllum imbricatum (Dickie) W.H.Adey, 1970
32. Species Mesophyllum incertum (Foslie) Me.Lemoine, 1928
33. Species Mesophyllum insigne (Foslie) W.H.Adey, 1970
34. Species Mesophyllum iraqense Johnson
35. Species Mesophyllum japonicum Ishijima, 1954 †
36. Species Mesophyllum koritzae (Lemoine) Lemoine, 1928 †
37. Species Mesophyllum kuehnemannii M.L.Mendoza, 1977
38. Species Mesophyllum laffittei Me.Lemoine, 1939 †
39. Species Mesophyllum lakiense Varma †
40. Species Mesophyllum lamellatum (Setchell & Foslie) W.H.Adey, 1970
41. Species Mesophyllum laxum Me.Lemoine, 1929
42. Species Mesophyllum lemoineae Souaya
43. Species Mesophyllum lichenoides (J.Ellis) Me.Lemoine, 1928
44. Species Mesophyllum macedonis Athanasiadis, 1999
45. Species Mesophyllum macroblastum (Foslie) W.H.Adey, 1970
46. Species Mesophyllum mangoense Johnson & Farris
47. Species Mesophyllum mazzapiedense Mastrorilli
48. Species Mesophyllum megagastri Athanasiadis, 2007
49. Species Mesophyllum mesomorphum (Foslie) W.H.Adey, 1970
50. Species Mesophyllum niinoi Ishijima
51. Species Mesophyllum nipponicum Ishijima, 1954
52. Species Mesophyllum nitidum (Foslie) W.H.Adey, 1970
53. Species Mesophyllum obsitum Airoldi
54. Species Mesophyllum ornatum (Foslie & M.Howe) Athanasiadis, 1999
55. Species Mesophyllum pacificum Johnson
56. Species Mesophyllum paronai (Raineri) Me.Lemoine
57. Species Mesophyllum peruvianum Johnson & Tafur
58. Species Mesophyllum pfenderae (Me.Lemoine) Me.Lemoine
59. Species Mesophyllum philippii (Foslie) Adey, 1970
60. Species Mesophyllum piuranum Branson
61. Species Mesophyllum piuranum Johnson & Tafur
62. Species Mesophyllum prolifer (Foslie) W.H.Adey
63. Species Mesophyllum pulchrum (Weber-van Bosse & Foslie) Me.Lemoine, 1928
64. Species Mesophyllum punjabense Varma
65. Species Mesophyllum ramosum Me.Lemoine, 1934 †
66. Species Mesophyllum rigidum Mastrorilli
67. Species Mesophyllum roveretoi Conti
68. Species Mesophyllum sancti-dionysii Me.Lemoine, 1939 †
69. Species Mesophyllum savornini L.E.Lemoine
70. Species Mesophyllum schenckii M.Howe, 1934 †
71. Species Mesophyllum schenkii
72. Species Mesophyllum siamense (Foslie) W.H.Adey, 1970
73. Species Mesophyllum sphaericum V.Pena, Bárbara, W.H.Adey, Riosmena-Rodrigues & H.G.Choi, 2011
74. Species Mesophyllum squamuliforme (Foslie) W.H.Adey, 1970
75. Species Mesophyllum stenopon Athanasiadis, 2007
76. Species Mesophyllum suganum (Rothpletz) Airoldi
77. Species Mesophyllum syntrophicum (Foslie) W.H.Adey, 1970
78. Species Mesophyllum syrphetodes W.H.Adey, R.A.Townsend & Boykins, 1982
79. Species Mesophyllum thelostegium (Foslie) W.H.Adey
80. Species Mesophyllum tropicale Me.Lemoine, 1934 †
81. Species Mesophyllum vancouveriense (Foslie) Steneck & R.T.Paine, 1986
82. Species Mesophyllum variabile (Foslie) W.H.Adey
83. Species Mesophyllum varians Me.Lemoine, 1934 †
84. Species Mesophyllum vaughanii (M.Howe) Me.Lemoine †
85. Species Mesophyllum vescum (Foslie) W.H.Adey
86. Species Mesophyllum vignyense (Me.Lemoine) Me.Lemoine †
87. Species Mesophyllum yabei Ishijima, 1942 †
88. Species Mesophyllum yuyashimaense Ishijima, 1954 †
89. Species Mesophyllum aemulans (Foslie & M.Howe) W.H.Adey, 1970 accepted as Melyvonnea aemulans (Foslie & M.Howe) Athanasiadis & D.L.Ballantine, 2014
90. Species Mesophyllum annulatum (Foslie) W.H.Adey, 1970 accepted as Phymatolithon lenormandii (J.E.Areschoug) W.H.Adey, 1966 (synonym)
91. Species Mesophyllum arcticum (Kjellman) Athanasiadis, 1996 accepted as Leptophytum arcticum (Kjellman) Athanasiadis, 2007 (synonym)
92. Species Mesophyllum aucklandicum (Foslie) W.H.Adey, 1970 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970 (synonym)
93. Species Mesophyllum australe (Foslie) Me.Lemoine accepted as Lithothamnion australe Foslie, 1904
94. Species Mesophyllum canariense (Foslie) Me.Lemoine, 1928 accepted as Melyvonnea canariensis (Foslie) Athanasiadis & D.L.Ballantine, 2014
95. Species Mesophyllum capense (Rosanoff) Y.M.Chamberlain, 2000 accepted as Capensia fucorum (Esper) A.Athanasiadis, 2017
96. Species Mesophyllum caraiensis (Foslie) M.Lemoine accepted as Mesophyllum canariense (Foslie) Me.Lemoine, 1928 accepted as Melyvonnea canariensis (Foslie) Athanasiadis & D.L.Ballantine, 2014
97. Species Mesophyllum chatamense (Foslie) W.H.Adey, 1970 accepted as Perithallis chatamensis (Foslie) Athanasiadis, 2021
98. Species Mesophyllum contii Ishijima, 1954 † accepted as Mesophyllum arakuraense Ishijima, 1954 †
99. Species Mesophyllum corallioides (P.L.Crouan & H.M.Crouan) Me.Lemoine accepted as Lithothamnion corallioides (P.Crouan & H.Crouan) P.Crouan & H.Crouan, 1867
100. Species Mesophyllum discrepans (Foslie) Me.Lemoine, 1928 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970
101. Species Mesophyllum erubescens (Foslie) Me.Lemoine, 1928 accepted as Melyvonnea erubescens (Foslie) Athanasiadis & D.L.Ballantine, 2014
102. Species Mesophyllum ferox (Foslie) W.H.Adey, 1970 accepted as Leptophytum ferox (Foslie) Y.M.Chamberlain & Keats, 1994
103. Species Mesophyllum floridanum (Foslie) W.H.Adey ex M.J.Wynne, 1986 accepted as Lithothamnion floridanum Foslie, 1906
104. Species Mesophyllum fuegianum (Foslie) W.H.Adey, 1970 accepted as Lithothamnion fuegianum (Foslie) Foslie, 1906
105. Species Mesophyllum fumigatum (Foslie) W.H.Adey, 1970 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970 (synonym)
106. Species Mesophyllum gabrielii (Foslie) W.H.Adey, 1970 accepted as Corallinapetra gabrielii (Foslie) S.Y.Jeong, W.A.Nelson, B.Y.Won & T.O.Cho, 2021 (unaccepted > junior objective synonym)
107. Species Mesophyllum incisum (Foslie) W.H.Adey, 1970 accepted as Perithallis incisa (Foslie) Athanasiadis, 2021
108. Species Mesophyllum lemniscatum (Foslie) W.H.Adey, 1970 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970 (synonym)
109. Species Mesophyllum madagascarense (Foslie) W.H.Adey, 1970 accepted as Melyvonnea madagascariensis (Foslie) Athanasiadis & D.L.Ballantine, 2014
110. Species Mesophyllum neglectum (Foslie) W.H.Adey, 1970 accepted as Synarthrophyton neglectum (Foslie) M.L.Mendoza, 1992 (synonym)
111. Species Mesophyllum patena (J.D.Hooker & Harvey) R.W.Ricker, 1987 accepted as Synarthrophyton patena (Hooker f. & Harvey) R.A.Townsend, 1979
112. Species Mesophyllum printzianum Woelkerling & A.S.Harvey, 1993 accepted as Printziana australis Athanasaidis, 2021
113. Species Mesophyllum proliferum (Foslie) W.H.Adey, 1970 accepted as Lithothamnion proliferum Foslie, 1904
114. Species Mesophyllum prolixum (Foslie) W.H.Adey, 1970 accepted as Leptophytum ferox (Foslie) Y.M.Chamberlain & Keats, 1994
115. Species Mesophyllum purpurascens (Foslie) W.H.Adey, 1970 accepted as Mesophyllum funafutiense (Foslie) Verheij, 1993
116. Species Mesophyllum reinhardtii N.L.Gardner accepted as Chlorochytrium cohnii E.P.Wright, 1877
117. Species Mesophyllum rupestre (Foslie) Adey, 1970 accepted as Harveylithon rupestre (Foslie) A.Rösler, Perfectti, V.Peña & J.C.Braga, 2016
118. Species Mesophyllum schmitzii (Hariot) Mendoza, 1977 accepted as Synarthrophyton schmitzii (Hariot) M.L.Mendoza, S.Molina & P.Ventura, 1996 (synonym)
119. Species Mesophyllum speciosum (Foslie) W.H.Adey, 1970 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970
120. Species Mesophyllum superpositum (Foslie) W.H.Adey, 1970 accepted as Roseolithon superpositum (Foslie) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
121. Species Mesophyllum tenue (Kjellman) Lebednik, 1975 accepted as Leptophytum tenue (Kjellman) Athanasiadis & W.H.Adey, 2006
122. Species Mesophyllum versicolor (Foslie) W.H.Adey, 1970 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970 (synonym)
123. Species Mesophyllum whidbeyense (Foslie) W.H.Adey, 1970 accepted as Pseudolithophyllum whidbeyense (Foslie) Steneck & R.T. Paine, 1986 (synonym)
124. Species Mesophyllum atascaderum J.H.Johnson & Tafur † (uncertain)
125. Species Mesophyllum austriacum Me.Lemoine † (uncertain)
126. Species Mesophyllum barkoukyi Souaya † (uncertain)
127. Species Mesophyllum californicum J.H.Johnson & W.A.Stewart † (uncertain)
128. Species Mesophyllum capilliforme Mastrorilli (uncertain)
129. Species Mesophyllum contractum Maslov (uncertain)
130. Species Mesophyllum daviesii S.R.Narayana Rao (uncertain)
131. Species Mesophyllum fecundus Johnson & Ferris (uncertain)
132. Species Mesophyllum flexile Mastrorilli (uncertain)
133. Species Mesophyllum fructiferum Airoldi (uncertain)
134. Species Mesophyllum funafutiense (Foslie) Verheij, 1993 (uncertain)
135. Species Mesophyllum galettoi Mastrorilli (uncertain)
136. Species Mesophyllum grande J.H.Johnson (uncertain)
137. Species Mesophyllum guamense J.H.Johnson (uncertain)
138. Species Mesophyllum inconspicuum (Foslie) W.H.Adey, 1970 (uncertain)
139. Species Mesophyllum ishigakiense Johnson (uncertain)
140. Species Mesophyllum isthmi (Howe) Lemoine (uncertain)
141. Species Mesophyllum javaense J.H.Johnson & B.J.Ferris, 1949 † (uncertain)
142. Species Mesophyllum kutense Maslov (uncertain)
143. Species Mesophyllum navarroi Airoldi (uncertain)
144. Species Mesophyllum prepulchrum Johnson & Ferris (uncertain)
145. Species Mesophyllum robustum J.H.Johnson (uncertain)
146. Species Mesophyllum ryukyuense Johnson (uncertain)
147. Species Mesophyllum simulans (Foslie) Me.Lemoine, 1928 (uncertain)
148. Species Mesophyllum varitextum Mastrorilli (uncertain)

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