1. Species Lithothamnion abrardi Me.Lemoine, 1934 †
2. Species Lithothamnion adeyi P.W.Gabrielson et al., 2000
3. Species Lithothamnion album Heydrich, 1897
4. Species Lithothamnion andamanense A.K.Chatterji & M.N.Gururaja, 1972
5. Species Lithothamnion andrusovii Me.Lemoine, 1934 †
6. Species Lithothamnion andrussowii K.N.Deckenbach, 1901
7. Species Lithothamnion angolense Romanes †
8. Species Lithothamnion australe Foslie, 1904
9. Species Lithothamnion bandanum Foslie, 1904
10. Species Lithothamnion betieri Me.Lemoine, 1939 †
11. Species Lithothamnion bourcartii Me.Lemoine, 1924 †
12. Species Lithothamnion brasiliense Foslie, 1900
13. Species Lithothamnion californicum Foslie, 1900
14. Species Lithothamnion cardinellense P.Fravega, M.Piazza & G.Vannucci, 1993 †
15. Species Lithothamnion carolii Me.Lemoine, 1920
16. Species Lithothamnion carpoklonion Athanasiadis & D.L.Ballantine, 2011
17. Species Lithothamnion chathamense Foslie, 1906
18. Species Lithothamnion controversum Lemoine, 1934 †
19. Species Lithothamnion corallinaeforme Me.Lemoine, 1924 †
20. Species Lithothamnion coralliniforme Me.Lemoine, 1924 †
21. Species Lithothamnion corallioides (P.Crouan & H.Crouan) P.Crouan & H.Crouan, 1867
22. Species Lithothamnion cottonii Me.Lemoine, 1929
23. Species Lithothamnion darwinii (Harvey) Areschoug, 1852
24. Species Lithothamnion dickiei Foslie, 1900
25. Species Lithothamnion diguetii Hariot, 1895
26. Species Lithothamnion dissidens (Foslie) Foslie, 1907
27. Species Lithothamnion falsellum Heydrich, 1897
28. Species Lithothamnion flabellatum Rosenvinge, 1893
29. Species Lithothamnion floridanum Foslie, 1906
30. Species Lithothamnion fuegianum (Foslie) Foslie, 1906
31. Species Lithothamnion geppiorum Me.Lemoine, 1917
32. Species Lithothamnion giammarinoi P.Fravega, M.Piazza & G.Vannucci, 1993 †
33. Species Lithothamnion gibbosum Foslie, 1907
34. Species Lithothamnion glaciale Kjellman, 1883
35. Species Lithothamnion granuliferum Foslie, 1905
36. Species Lithothamnion guadalupense E.Y.Dawson, 1961
37. Species Lithothamnion heterocladum Foslie, 1905
38. Species Lithothamnion islei Heydrich, 1901
39. Species Lithothamnion japonicum Foslie, 1900
40. Species Lithothamnion kasedaensis Ishijima, 1954 †
41. Species Lithothamnion kerguelenum (Dickie) Foslie, 1898
42. Species Lithothamnion kraftii P.W.Gabrielson, 2023
43. Species Lithothamnion lacroixi Lemoine, 1918 †
44. Species Lithothamnion laminosum M.Howe, 1934 †
45. Species Lithothamnion lemoineae Adey, 1970
46. Species Lithothamnion magnum Capeder, 1900
47. Species Lithothamnion maldivicum Foslie, 1903
48. Species Lithothamnion manginii Me.Lemoine & Rosenvinge, 1913
49. Species Lithothamnion marlothii Heydrich, 1897
50. Species Lithothamnion minervae Basso, 1995
51. Species Lithothamnion montereyicum Foslie, 1906
52. Species Lithothamnion moretii Me.Lemoine, 1928 †
53. Species Lithothamnion muelleri Lenormand ex Rosanoff, 1866
54. Species Lithothamnion nanosporum J.H.Johnson & B.J.Ferris, 1949 †
55. Species Lithothamnion nodosum (Kützing) Woelkerling, 1985
56. Species Lithothamnion norvegicum (Areschoug) Kjellman, 1883
57. Species Lithothamnion novae-zelandiae Foslie, 1929
58. Species Lithothamnion occidentale (Foslie) Foslie, 1908
59. Species Lithothamnion orthoblastum Heydrich
60. Species Lithothamnion pauciporosum Me.Lemoine, 1920
61. Species Lithothamnion peleense Me.Lemoine, 1918 †
62. Species Lithothamnion perulatum Gümbel, 1871
63. Species Lithothamnion peruviense Heydrich, 1901
64. Species Lithothamnion philippi
65. Species Lithothamnion pocillum M.Lemoine, 1929
66. Species Lithothamnion praefruticulosum Maslov, 1956 †
67. Species Lithothamnion proliferum Foslie, 1904
68. Species Lithothamnion propontidis Foslie, 1899
69. Species Lithothamnion ramosissimum (Reuss) W.E.Piller, 1994 †
70. Species Lithothamnion rubrum
71. Species Lithothamnion ruptile (Foslie) Foslie, 1907
72. Species Lithothamnion saundersii P.W.Gabrielson, 2023
73. Species Lithothamnion scabiosum (Harvey) Foslie, 1898
74. Species Lithothamnion sejunctum Foslie, 1906
75. Species Lithothamnion sonderi Hauck, 1883
76. Species Lithothamnion spissum Foslie, 1907
77. Species Lithothamnion steneckii Mariath & Figueiredo, 2012
78. Species Lithothamnion synanablastum
79. Species Lithothamnion thelostegium Foslie, 1907
80. Species Lithothamnion ungeri Kjellman, 1883
81. Species Lithothamnion valens Foslie, 1909
82. Species Lithothamnion validum (Foslie) Foslie, 1906
83. Species Lithothamnion variabile Foslie, 1906
84. Species Lithothamnion varians Foslie, 1895
85. Species Lithothamnion volcanum E.Y.Dawson, 1960
86. Species Lithothamnion woelkerlingii P.W.Gabrielson & Maneveldt, 2023
87. Species Lithothamnion absonum Foslie, 1907 accepted as Phymatolithon repandum (Foslie) Wilks & Woelkerling, 1994 (synonym)
88. Species Lithothamnion acervatum Foslie, 1907 accepted as Leptophytum acervatum (Foslie) Y.M.Chamberlain & Keats, 1994
89. Species Lithothamnion aculeiferum L.R.Mason, 1943 accepted as Mesophyllum crassiusculum (Foslie) Lebednik, 2004
90. Species Lithothamnion adplicitum Foslie, 1897 accepted as Lithophyllum pustulatum (J.V.Lamouroux) Foslie, 1904 accepted as Titanoderma pustulatum (J.V.Lamouroux) Nägeli, 1858
91. Species Lithothamnion aemulans (Foslie & M.Howe) Foslie, 1908 accepted as Melyvonnea aemulans (Foslie & M.Howe) Athanasiadis & D.L.Ballantine, 2014
92. Species Lithothamnion affine foslie, 1897 accepted as Lithophyllum kotschyanum f. affine (Foslie) Foslie, 1909 (synonym)
93. Species Lithothamnion agariciforme Foslie, 1898 accepted as Mesophyllum lichenoides (J.Ellis) Me.Lemoine, 1928 (synonym)
94. Species Lithothamnion alcicorne Kjellman, 1883 accepted as Boreolithothamnion tophiforme (Esper) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
95. Species Lithothamnion annulatum Foslie, 1906 accepted as Phymatolithon lenormandii (J.E.Areschoug) W.H.Adey, 1966
96. Species Lithothamnion antarcticum (J.D.Hooker & Harvey) Heydrich, 1901 accepted as Carlskottsbergia antarctica (J.D.Hooker & Harvey) Athanasiadis, 2018 (synonym)
97. Species Lithothamnion arcticum (Kjellman) Foslie, 1900 accepted as Mesophyllum arcticum (Kjellman) Athanasiadis, 1996 accepted as Leptophytum arcticum (Kjellman) Athanasiadis, 2007
98. Species Lithothamnion asperulum (Foslie) Foslie, 1907 accepted as Phymatolithon repandum (Foslie) Wilks & Woelkerling, 1994
99. Species Lithothamnion aucklandicum (Foslie) Foslie, 1907 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970 (synonym)
100. Species Lithothamnion bamleri Heydrich, 1897 accepted as Lithophyllum bamleri (Heydrich) Heydrich, 1897
101. Species Lithothamnion battersii Foslie, 1896 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023 (synonym)
102. Species Lithothamnion bisporum Foslie, 1906 accepted as Leptophytum bisporum (Foslie) Adey, 1970
103. Species Lithothamnion boreale Foslie, 1891 accepted as Lithothamnion glaciale Kjellman, 1883 (synonym)
104. Species Lithothamnion bornetii Foslie, 1899 accepted as Leptophytum bornetii (Foslie) W.H.Adey, 1970 (synonym)
105. Species Lithothamnion brachycladum Foslie, 1900 accepted as Mesophyllum brachycladum (Foslie) W.H.Adey, 1970
106. Species Lithothamnion brasilense accepted as Lithothamnion brasiliense Foslie, 1900
107. Species Lithothamnion brassica-florida (Harvey) Areschoug, 1852 accepted as Neogoniolithon brassica-florida (Harvey) Setchell & L.R.Mason, 1943
108. Species Lithothamnion breviaxe Foslie, 1895 accepted as Boreolithothamnion soriferum (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
109. Species Lithothamnion byssoides (Lamarck) Philippi, 1837 accepted as Lithophyllum byssoides (Lamarck) Foslie, 1900
110. Species Lithothamnion calcareum (Pallas) Areschoug, 1852 accepted as Phymatolithon calcareum (Pallas) W.H.Adey & D.L.McKibbin ex Woelkering & L.M.Irvine, 1986 (synonym)
111. Species Lithothamnion canariense Foslie, 1906 accepted as Melyvonnea canariensis (Foslie) Athanasiadis & D.L.Ballantine, 2014
112. Species Lithothamnion capense (Rosanoff) Foslie, 1898 accepted as Mesophyllum capense (Rosanoff) Y.M.Chamberlain, 2000 accepted as Capensia fucorum (Esper) A.Athanasiadis, 2017
113. Species Lithothamnion chatamense Foslie, 1906 accepted as Perithallis chatamensis (Foslie) Athanasiadis, 2021 (synonym)
114. Species Lithothamnion circumscriptum Strömfelt, 1886 accepted as Clathromorphum circumscriptum (Strömfelt) Foslie, 1898
115. Species Lithothamnion coalescens Foslie, 1895 accepted as Clathromorphum compactum (Kjellman) Foslie, 1898
116. Species Lithothamnion colliculosum Foslie, 1891 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023 (synonym)
117. Species Lithothamnion compactum Kjellman, 1883 accepted as Clathromorphum compactum (Kjellman) Foslie, 1898 (synonym)
118. Species Lithothamnion conchatum Setchell & Foslie, 1902 accepted as Mesophyllum conchatum (Setchell & Foslie) W.H.Adey, 1970
119. Species Lithothamnion congregatum Foslie, 1895 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
120. Species Lithothamnion coralloides accepted as Lithothamnion corallioides (P.Crouan & H.Crouan) P.Crouan & H.Crouan, 1867
121. Species Lithothamnion corticiforme (Kützing) Foslie, 1898 accepted as Melobesia membranacea (Esper) J.V.Lamouroux, 1812
122. Species Lithothamnion coulmanicum Foslie, 1905 accepted as Leptophytum coulmanicum (Foslie) Adey, 1970 (synonym)
123. Species Lithothamnion crassiusculum (Foslie) L.R.Mason, 1943 accepted as Mesophyllum crassiusculum (Foslie) Lebednik, 2004
124. Species Lithothamnion crassum Philippi, 1837 accepted as Lithophyllum racemus (Lamarck) Foslie, 1901
125. Species Lithothamnion crenulatum (Foslie) Foslie, 1907 accepted as Mesophyllum schmitzii (Hariot) Mendoza, 1977 accepted as Synarthrophyton schmitzii (Hariot) M.L.Mendoza, S.Molina & P.Ventura, 1996
126. Species Lithothamnion crispatum Hauck, 1878 accepted as Roseolithon crispatum (Hauck) P.W.Gabrielson, Maneveldt, Hughey & V.peña, 2023
127. Species Lithothamnion cystocarpideum Foslie, 1906 accepted as Mesophyllum cystocarpideum (Foslie) W.H.Adey, 1970
128. Species Lithothamnion decipiens Foslie, 1897 accepted as Chamberlainium decipiens (Foslie) Caragnano, Foetisch, Maneveldt & Payri, 2018
129. Species Lithothamnion decussatum Foslie, 1895 accepted as Sphaeranthera decussata (Foslie) Heydrich
130. Species Lithothamnion decutescens Heydrich, 1901 accepted as Goniolithon decutescens (Heydrich) Foslie ex M.A.Howe, 1918
131. Species Lithothamnion deformans (Solms-Laubach) Foslie, 1898 accepted as Choreonema thuretii (Bornet) F.Schmitz, 1889 (synonym)
132. Species Lithothamnion dehiscens Foslie, 1895 accepted as Lithothamnion fornicatum Foslie, 1891 accepted as Boreolithothamnion soriferum (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
133. Species Lithothamnion dentatum (Kützing) Hauck, 1877 accepted as Lithophyllum dentatum (Kützing) Foslie, 1898
134. Species Lithothamnion depressum P.L.Crouan & H.M.Crouan, 1867 accepted as Lithophyllum bathyporum Athanasiadis & D.L.Ballantine, 2011
135. Species Lithothamnion dickei Foslie, 1900 accepted as Mesophyllum imbricatum (Dickie) W.H.Adey, 1970
136. Species Lithothamnion dimorphum Foslie, 1895 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
137. Species Lithothamnion discrepans Foslie, 1907 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970
138. Species Lithothamnion divergens Foslie, 1895 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
139. Species Lithothamnion durum Kjellman, 1889 accepted as Clathromorphum circumscriptum (Strömfelt) Foslie, 1898
140. Species Lithothamnion ectocarpon Foslie, 1907 accepted as Mesophyllum ectocarpon (Foslie) W.H.Adey, 1970 (synonym)
141. Species Lithothamnion elegans Foslie, 1895 accepted as Lithophyllum elegans (Foslie) Foslie, 1900 (synonym)
142. Species Lithothamnion emboloides Heydrich, 1900 accepted as Phymatolithon laevigatum (Foslie) Foslie, 1898
143. Species Lithothamnion engelhartii Foslie, 1900 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970
144. Species Lithothamnion erubescens Foslie, 1900 accepted as Melyvonnea erubescens (Foslie) Athanasiadis & D.L.Ballantine, 2014
145. Species Lithothamnion erythraeum Rothpletz, 1893 accepted as Sporolithon erythraeum (Rothpletz) Kylin, 1956
146. Species Lithothamnion evanescens Foslie, 1895 accepted as Clathromorphum circumscriptum (Strömfelt) Foslie, 1898
147. Species Lithothamnion exasperatum Foslie, 1907 accepted as Mesophyllum exasperatum (Foslie) W.H.Adey, 1970 (synonym)
148. Species Lithothamnion expansum (Philippi) Foslie, 1895 accepted as Mesophyllum expansum (Philippi) Cabioch & M.L.Mendoza, 2003 (synonym)
149. Species Lithothamnion fasciculatum (Lamarck) Areschoug, 1852 accepted as Lithophyllum fasciculatum (Lamarck) Foslie, 1898 (synonym)
150. Species Lithothamnion ferox Foslie, 1907 accepted as Leptophytum ferox (Foslie) Y.M.Chamberlain & Keats, 1994
151. Species Lithothamnion flavescens Kjellman, 1883 accepted as Leptophytum flavescens (Kjellman) Athanasiadis, 2016
152. Species Lithothamnion foecundum Kjellman, 1883 accepted as Leptophytum foecundum (Kjellman) W.H.Adey, 1966 (synonym)
153. Species Lithothamnion fornicatum Foslie, 1891 accepted as Boreolithothamnion soriferum (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
154. Species Lithothamnion fosliei Heydrich, 1897 accepted as Neogoniolithon fosliei (Heydrich) Setchell & L.R.Mason, 1943
155. Species Lithothamnion fragilissimum Foslie, 1904 accepted as Mesophyllum fragilissimum (Foslie) Me.Lemoine, 1928
156. Species Lithothamnion fretense Foslie, 1907 accepted as Lithothamnion japonicum Foslie, 1900
157. Species Lithothamnion fruticulosum (Kützing) Foslie, 1895 accepted as Spongites fruticulosa Kützing, 1841 (synonym)
158. Species Lithothamnion fruticulosus accepted as Lithothamnion fruticulosum (Kützing) Foslie, 1895 accepted as Spongites fruticulosa Kützing, 1841
159. Species Lithothamnion fumigatum Foslie, 1901 accepted as Mesophyllum engelhartii (Foslie) W.H.Adey, 1970 (synonym)
160. Species Lithothamnion funafutiense (Foslie) Foslie, 1901 accepted as Mesophyllum funafutiense (Foslie) Verheij, 1993
161. Species Lithothamnion gabrieli Foslie, 1905 accepted as Corallinapetra gabrielii (Foslie) S.Y.Jeong, W.A.Nelson, B.Y.Won & T.O.Cho, 2021 (unaccepted > junior objective synonym)
162. Species Lithothamnion galapagense Foslie, 1907 accepted as Melobesia galapagensis (Foslie) W.R.Taylor, 1945
163. Species Lithothamnion giganteum L.R.Mason, 1943 accepted as Boreolithothamnion giganteum (L.R.Mason) P.W.Gabrielson, Maneveldt, Hughey & V.Pena, 2023
164. Species Lithothamnion gracilescens Foslie, 1895 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
165. Species Lithothamnion grani accepted as Lithothamnion granii (Foslie) Foslie, 1900 accepted as Boreolithothamnion soriferum (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
166. Species Lithothamnion granii (Foslie) Foslie, 1900 accepted as Boreolithothamnion soriferum (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023 (synonym)
167. Species Lithothamnion grumosum Foslie, 1897 accepted as Lithophyllum grumosum (Foslie) Foslie, 1898
168. Species Lithothamnion hamelii Me.Lemoine, 1931 accepted as Phymatolithon calcareum (Pallas) W.H.Adey & D.L.McKibbin ex Woelkering & L.M.Irvine, 1986
169. Species Lithothamnion haptericola Foslie, 1906 accepted as Mesophyllum haptericola (Foslie) W.H.Adey, 1970 (synonym)
170. Species Lithothamnion hauckii Rothpletz, 1891 accepted as Neogoniolithon mamillosum (Hauck) Setchell & L.R.Mason, 1943
171. Species Lithothamnion heteromorphum (Foslie) Foslie, 1907 accepted as Lithothamnion crispatum Hauck, 1878 accepted as Roseolithon crispatum (Hauck) P.W.Gabrielson, Maneveldt, Hughey & V.peña, 2023 (synonym)
172. Species Lithothamnion imbricatum Dickie, 1877 accepted as Mesophyllum imbricatum (Dickie) W.H.Adey, 1970
173. Species Lithothamnion incertum Foslie, 1904 accepted as Mesophyllum incertum (Foslie) Me.Lemoine, 1928
174. Species Lithothamnion incisum (Foslie) Foslie, 1907 accepted as Mesophyllum incisum (Foslie) W.H.Adey, 1970 accepted as Perithallis incisa (Foslie) Athanasiadis, 2021 (synonym)
175. Species Lithothamnion inconspicuum Foslie, 1907 accepted as Mesophyllum inconspicuum (Foslie) W.H.Adey, 1970
176. Species Lithothamnion incrassatum (Foslie) Jadin, 1935 accepted as Lithophyllum acrocamptum Heydrich, 1902
177. Species Lithothamnion incrustans (Philippi) Foslie, 1895 accepted as Lithophyllum incrustans Philippi, 1837
178. Species Lithothamnion indicum Foslie, 1907 accepted as Roseolithon indicum (Foslie) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
179. Species Lithothamnion insigne Foslie, 1906 accepted as Mesophyllum insigne (Foslie) W.H.Adey, 1970 (synonym)
180. Species Lithothamnion intermedium Kjellman, 1883 accepted as Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña, 2023
181. Species Lithothamnion investiens Foslie, 1895 accepted as Phymatolithon investiens Foslie, 1905 (synonym)
182. Species Lithothamnion irregulare Foslie, 1907 accepted as Lithophyllum irregulare (Foslie) P.Huvé ex Steentoft, 1967
183. Species Lithothamnion kaiseri Heydrich, 1897 accepted as Lithophyllum kaiseri (Heydrich) Heydrich, 1897
184. Species Lithothamnion laeve (Foslie) Foslie, 1898 accepted as Leptophytum laeve W.H.Adey, 1966
185. Species Lithothamnion laevigatum Foslie, 1895 accepted as Phymatolithon laevigatum (Foslie) Foslie, 1898 (synonym)
186. Species Lithothamnion lamellatum Setchell & Foslie, 1903 (unaccepted)
187. Species Lithothamnion lemniscatum Foslie, 1907 (unaccepted, synonym)
188. Species Lithothamnion lenormandii (J.E.Areschoug) Foslie, 1895 (unaccepted, synonym)
189. Species Lithothamnion lichenoides (J.Ellis) Foslie, 1895 (unaccepted, synonym)
190. Species Lithothamnion loculosum Kjellman, 1889 (unaccepted)
191. Species Lithothamnion macroblastum Foslie, 1897 (unaccepted)
192. Species Lithothamnion madagascarense (Foslie) Foslie, 1906 (unaccepted)
193. Species Lithothamnion magellanicum Foslie, 1895 (unaccepted)
194. Species Lithothamnion mamillare (Harvey) Areschoug, 1852 (unaccepted)
195. Species Lithothamnion mamillosum Hauck, 1885 (unaccepted)
196. Species Lithothamnion margaritae Hariot, 1895 (unaccepted)
197. Species Lithothamnion marginatum (Setchell & Foslie) Setchell & Foslie, 1908 (unaccepted)
198. Species Lithothamnion mediocre (Foslie) Foslie & Nichols, 1908 (unaccepted)
199. Species Lithothamnion membranaceum (Esper) Foslie, 1898 (unaccepted, synonym)
200. Species Lithothamnion meneghianum Vinassa, 1892 (unaccepted)
201. Species Lithothamnion mesomorphum Foslie, 1901 (unaccepted)
202. Species Lithothamnion microsporum (Foslie) Foslie, 1929 (unaccepted)
203. Species Lithothamnion mirabile (Foslie) Foslie, 1909 (unaccepted, synonym)
204. Species Lithothamnion moluccense Foslie, 1897 (unaccepted)
205. Species Lithothamnion muricatum (Foslie) De Toni, 1924 (unaccepted, synonym)
206. Species Lithothamnion myriocarpum Foslie, 1897 (unaccepted)
207. Species Lithothamnion neglectum (Foslie) Foslie, 1902 (unaccepted)
208. Species Lithothamnion nitidum Foslie, 1901 (unaccepted)
209. Species Lithothamnion nodulosum Foslie, 1895 (unaccepted)
210. Species Lithothamnion notarisii (Dufour) Me.Lemoine, 1915 (unaccepted)
211. Species Lithothamnion notatum Foslie, 1906 (unaccepted)
212. Species Lithothamnion oblimans Heydrich, 1897 (unaccepted)
213. Species Lithothamnion obtectulum (Foslie) Foslie, 1900 (unaccepted)
214. Species Lithothamnion ocellatum Foslie, 1895 (unaccepted)
215. Species Lithothamnion onkodes Heydrich, 1897 (unaccepted)
216. Species Lithothamnion orbiculatum Foslie, 1895 (unaccepted, basionym)
217. Species Lithothamnion pacificum (Foslie) Foslie, 1906 (unaccepted, synonym)
218. Species Lithothamnion pallescens Foslie, 1895 (unaccepted)
219. Species Lithothamnion papillosum Zanardini ex Hauck, 1883 (unaccepted)
220. Species Lithothamnion parcum Setchell & Foslie, 1907 (unaccepted)
221. Species Lithothamnion patena (J.D.Hooker & Harvey) Heydrich, 1897 (unaccepted)
222. Species Lithothamnion philippii Foslie, 1897 (unaccepted)
223. Species Lithothamnion phymatodeum Foslie, 1902 (unaccepted)
224. Species Lithothamnion polymorphum Areschoug, 1852 (unaccepted, Illegitimate: superfluous substitute name)
225. Species Lithothamnion ponderosum Foslie (unaccepted)
226. Species Lithothamnion proboscideum Foslie, 1897 (unaccepted)
227. Species Lithothamnion prolixum Foslie, 1908 (unaccepted)
228. Species Lithothamnion proponttidis Foslie (unaccepted)
229. Species Lithothamnion prototypum Foslie, 1897 (unaccepted)
230. Species Lithothamnion pseudolichenoides (Heydrich) Lemoine, 1910 (unaccepted)
231. Species Lithothamnion pulchrum Weber-van Bosse & Foslie, 1901 (unaccepted)
232. Species Lithothamnion purpurascens (Foslie) Foslie, 1907 (unaccepted)
233. Species Lithothamnion purpureum P.Crouan & H.Crouan, 1867 (unaccepted)
234. Species Lithothamnion pygmaeum Heydrich, 1897 (unaccepted)
235. Species Lithothamnion racemus (Lamarck) J.E. Areschoug, 1852 (unaccepted)
236. Species Lithothamnion ramulosum Philippi, 1837 (unaccepted)
237. Species Lithothamnion reclinatum (Foslie) Foslie, 1907 (unaccepted)
238. Species Lithothamnion repandum Foslie, 1904 (unaccepted)
239. Species Lithothamnion retusum Foslie, 1897 (unaccepted)
240. Species Lithothamnion rosanoffii Foslie, 1908 (unaccepted)
241. Species Lithothamnion roseum Batters, 1893 (unaccepted)
242. Species Lithothamnion rugosum Foslie, 1900 (unaccepted, synonym)
243. Species Lithothamnion scabriusculum Foslie, 1895 (unaccepted)
244. Species Lithothamnion schmitzii (Hariot) Heydrich, 1901 (unaccepted)
245. Species Lithothamnion scutelloides Heydrich, 1900 (unaccepted)
246. Species Lithothamnion setchellii Foslie, 1897 (unaccepted)
247. Species Lithothamnion siamense Foslie, 1901 (unaccepted, synonym)
248. Species Lithothamnion simulans (Foslie) Foslie, 1904 (unaccepted)
249. Species Lithothamnion solutum (Foslie) Foslie, 1908 (unaccepted, synonym)
250. Species Lithothamnion soriferum Kjellman, 1883 (unaccepted)
251. Species Lithothamnion speciosum (Foslie) Foslie, 1907 (unaccepted)
252. Species Lithothamnion squamuliforme Foslie, 1905 (unaccepted, synonym)
253. Species Lithothamnion squamulosum Foslie, 1895 (unaccepted)
254. Species Lithothamnion squarrulosum Foslie, 1899 (unaccepted, synonym)
255. Species Lithothamnion stefaninii Airoldi, 1932 † (unaccepted, synonym)
256. Species Lithothamnion subtenellum (Foslie) Me.Lemoine, 1915 (unaccepted, synonym)
257. Species Lithothamnion superpositum Foslie, 1900 (unaccepted, synonym)
258. Species Lithothamnion syntrophicum Foslie, 1901 (unaccepted)
259. Species Lithothamnion taltalense Foslie, 1906 (unaccepted, synonym)
260. Species Lithothamnion tamiense Heydrich, 1897 (unaccepted)
261. Species Lithothamnion tenue Rosenvinge, 1893 (unaccepted)
262. Species Lithothamnion tenue (Kjellman) Foslie, 1895 (unaccepted, synonym)
263. Species Lithothamnion tenuissimum Foslie, 1900 (unaccepted, synonym)
264. Species Lithothamnion testaceum Foslie, 1895 (unaccepted)
265. Species Lithothamnion tophiforme (Esper) Unger, 1858 (unaccepted)
266. Species Lithothamnion trichotomum Heydrich, 1901 (unaccepted)
267. Species Lithothamnion tusterense Foslie, 1905 (unaccepted)
268. Species Lithothamnion uncinatum Foslie, 1895 (unaccepted)
269. Species Lithothamnion vanheurckii Heydrich, 1905 (unaccepted)
270. Species Lithothamnion van-heurckii Heydrich in Chalon, 1905 (unaccepted)
271. Species Lithothamnion vardoeense Foslie, 1905 (unaccepted)
272. Species Lithothamnion versicolor Foslie, 1907 (unaccepted, synonym)
273. Species Lithothamnion vescum Foslie, 1907 (unaccepted)
274. Species Lithothamnion yendoi (Foslie) Me.Lemoine, 1965 (unaccepted, synonym)
275. Species Lithothamnion amplexifrons (Harvey) Lemoine ex Taylor, 1960 (uncertain)
276. Species Lithothamnion apiculatum Foslie, 1895 (uncertain, synonym)
277. Species Lithothamnion borneoense J.H.Johnson & B.J.Ferris, 1949 † (uncertain)
278. Species Lithothamnion botrytoides Foslie, 1898 (uncertain, synonym)
279. Species Lithothamnion delapsum Foslie, 1895 (uncertain)
280. Species Lithothamnion elegans Zanardini, 1843 (uncertain, uncertain taxonomic status subjected to verification)
281. Species Lithothamnion esperi Heydrich, 1897 (uncertain)
282. Species Lithothamnion faurai Me.Lemoine, 1928 † (uncertain)
283. Species Lithothamnion grande Foslie, 1905 (uncertain)
284. Species Lithothamnion granulosum Zanardini, 1843 (uncertain, uncertain taxonomic status subjected to verification)
285. Species Lithothamnion labradorense Heydrich, 1901 (uncertain)
286. Species Lithothamnion mauryae Howe, 1936 † (uncertain)
287. Species Lithothamnion murmanicum Elenkin, 1905 (uncertain)
288. Species Lithothamnion regonis Howe, 1936 † (uncertain)
289. Species Lithothamnion stroemfeltii Foslie, 1895 (uncertain, synonym)

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