1. Species Phormidium abronema Skuja, 1949
2. Species Phormidium acidophilum J.J.Copeland, 1936
3. Species Phormidium acula (Brühl & Biswas) Anagnostidis & Komárek, 1988
4. Species Phormidium alaskense Gomont ex Frémy, 1927
5. Species Phormidium allorgei (Frémy) Anagnostidis & Komárek, 1988
6. Species Phormidium ambiguum Gomont, 1892
7. Species Phormidium anabaenoides Drouet, 1961
8. Species Phormidium anomalum (Bharadwaja) Anagnostidis & Komárek, 1988
9. Species Phormidium aqualimpidense (P.A.C.Senna & L.V.Ferreira) M.T.P.Azevedo, 1991
10. Species Phormidium arboricola N.M.Lemes da Silva, L.H.Zanini Branco & O.Necchi, Jr., 2013
11. Species Phormidium arthrospiroides (Virieux) Anagnostidis & Komárek, 1988
12. Species Phormidium arthurensis P.M.Novis & G.Visnovsky, 2011
13. Species Phormidium articulatum (N.L.Gardner) Anagnostidis & Komárek, 1988
14. Species Phormidium arvense (C.B.Rao) Anagnostidis, 2001
15. Species Phormidium australe J.Phillipson, 1925
16. Species Phormidium azoricum O.C.Schmidt, 1931
17. Species Phormidium baculum (Gomont ex Gomont) Anagnostidis, 2001
18. Species Phormidium bajahense J.J.Copeland, 1936
19. Species Phormidium beccarianum (Gomont ex Forti) Anagnostidis & Komárek, 1988
20. Species Phormidium bekesiense (I.Kiss) K.Kiss, 2001
21. Species Phormidium beppuense Yoneda, 1938
22. Species Phormidium biforme Schwabe, 1936
23. Species Phormidium bohneri Schmidle, 1902
24. Species Phormidium boryanum (Gomont) Anagnostidis & Komárek, 1988
25. Species Phormidium breve (Kützing ex Gomont) Anagnostidis & Komárek, 1988
26. Species Phormidium breviarticulatum C.-C.Jao, 1940
27. Species Phormidium bulgaricum (Komárek) Anagnostidis & Komárek, 1988
28. Species Phormidium caerulescens (Gicklhorn) Anagnostidis, 2001
29. Species Phormidium caerulescens P.Crouan & H.Crouan ex Gomont, 1892
30. Species Phormidium calcareum Kützing ex Gomont, 1892
31. Species Phormidium calcicola N.L.Gardner, 1927
32. Species Phormidium calciphilum I.Umezaki, 1995
33. Species Phormidium californicum Drouet, 1942
34. Species Phormidium carboniciphilum (Prát) Anagnostidis & Komárek, 1988
35. Species Phormidium ceylanicum Wille, 1924
36. Species Phormidium chalybeum (Mertens ex Gomont) Anagnostidis & Komárek, 1988
37. Species Phormidium chungii N.L.Gardner, 1927
38. Species Phormidium cliarense (West) Anagnostidis & Komárek, 1988
39. Species Phormidium conradii (Kufferath) Anagnostidis & Komárek, 1988
40. Species Phormidium constrictum Klas, 1938
41. Species Phormidium corbierei (Frémy) Anagnostidis, 2001
42. Species Phormidium corium Gomont ex Gomont, 1892
43. Species Phormidium coutinhoi J.Sampaio, 1941
44. Species Phormidium crassior (Behre) Anagnostidis, 2001
45. Species Phormidium crassivaginatum (Claus) Anagnostidis & Komárek, 1988
46. Species Phormidium crouani Gomont, 1892
47. Species Phormidium curvatum Hieronymus, 1892
48. Species Phormidium deflexoides (Elenkin & Kossinskaja) Anagnostidis & Komárek, 1988
49. Species Phormidium desikacharyiense Vasishta, 1962
50. Species Phormidium diguetii (Gomont) Anagnostidis & Komárek, 1988
51. Species Phormidium dimorphum Lemmermann, 1908
52. Species Phormidium dudicsianum (Claus) Anagnostidis, 2001
53. Species Phormidium durum N.L.Gardner, 1927
54. Species Phormidium edessae Skuja, 1937
55. Species Phormidium endolithicum Ercegovic, 1932
56. Species Phormidium endospongeliae I.Umezaki, 1995
57. Species Phormidium exospirum (Skuja) Anagnostidis, 2001
58. Species Phormidium favosum Gomont, 1892
59. Species Phormidium feldmannii Frémy, 1937
60. Species Phormidium foreaui (Frémy) Umezaki & Watanabe, 1994
61. Species Phormidium fragmentosum Wawrik, 1986
62. Species Phormidium fuellebornii Schmidle, 1902
63. Species Phormidium gardneri Muzafarov, 1959
64. Species Phormidium gardnerianum Drouet, 1942
65. Species Phormidium grande Playfair, 1918
66. Species Phormidium granulatum (N.L.Gardner) Anagnostidis, 2001
67. Species Phormidium griseoviolaceum (Skuja) Anagnostidis, 2001
68. Species Phormidium groesbeckianum Drouet, 1942
69. Species Phormidium grunowianum (Gomont) Anagnostidis & Komárek, 1988
70. Species Phormidium gyrale B.N.Prasad & Mehrotra, 1977
71. Species Phormidium hamelii (Frémy) Anagnostidis & Komárek, 1988
72. Species Phormidium hancockii (Drouet) Drouet, 1942
73. Species Phormidium hansgirgii Schmidle, 1900
74. Species Phormidium henningsii Lemmermann, 1907
75. Species Phormidium hiemale (Jaag) Anagnostidis, 2001
76. Species Phormidium hieronymusii Lemmermann, 1888
77. Species Phormidium holdenii (Forti) Branco, Sant'Anna, Azevedo & Sormus, 1997
78. Species Phormidium hormoides Setchell & N.L.Gardner, 1918
79. Species Phormidium hoshiarpurense Vasishta, 1965
80. Species Phormidium hyalinum Bongale, 1987
81. Species Phormidium hydrocoleoides Drouet, 1942
82. Species Phormidium ibusukiense (Emoto & Yoneda) Anagnostidis & Komárek, 1988
83. Species Phormidium incrustatum Gomont ex Gomont, 1892
84. Species Phormidium ingrediens Backhaus, 2010
85. Species Phormidium ingricum (Woronichin) Anagnostidis & Komárek, 1988
86. Species Phormidium insigne (Skuja) Anagnostidis, 2001
87. Species Phormidium insulare (N.L.Gardner) P.A.C.Senna & Compère, 1998
88. Species Phormidium interruptum Kützing ex Forti, 1907
89. Species Phormidium inundatum Kützing ex Gomont, 1892
90. Species Phormidium irriguum (Kützing ex Gomont) Anagnostidis & Komárek, 1988
91. Species Phormidium jadinianum Gomont, 1893
92. Species Phormidium janthiphorum (Gomont) Elenkin, 1949
93. Species Phormidium jenkelianum G.Schmid, 1914
94. Species Phormidium karakalpakense (Muzafarov) Anagnostidis & Komárek, 1988
95. Species Phormidium kolkwitzii Komárek, 2001
96. Species Phormidium kondratjevae O.N.Vinogradova, 2011
97. Species Phormidium koprophilum (Skuja) Anagnostidis, 2001
98. Species Phormidium kuetzingianum (Kirchner ex Hansgirg) Anagnostidis & Komárek, 1988
99. Species Phormidium lacustre (Cado) Anagnostidis, 2001
100. Species Phormidium laysanense Lemmermann, 1905
101. Species Phormidium lismorense (Playfair) Anagnostidis & Komárek, 1988
102. Species Phormidium litorale Golubic, 1960
103. Species Phormidium lividum (Hansgirg) Forti, 1907
104. Species Phormidium lucidum Kützing ex Gomont, 1892
105. Species Phormidium lusitanicum (J.Sampaio) Anagnostidis, 2001
106. Species Phormidium lutescens (Hansgirg) Anagnostidis & Komárek, 1988
107. Species Phormidium macedonicum Cado, 1959
108. Species Phormidium martinii (Frémy) Anagnostidis & Komárek, 1988
109. Species Phormidium mehrai Vasishta, 1962
110. Species Phormidium membranaceum Kützing ex Gomont, 1892
111. Species Phormidium meneghinianum Kützing ex Gomont, 1892
112. Species Phormidium minimum O.C.Schmidt, 1931
113. Species Phormidium minnesotense (Tilden) Drouet, 1942
114. Species Phormidium minutum Skvortsov, 1937
115. Species Phormidium minutum Lindstedt, 1943
116. Species Phormidium molischii (Vouk) Anagnostidis & Komárek, 1988
117. Species Phormidium monile Setchell & N.L.Gardner, 1930
118. Species Phormidium naveanum Grunow, 1865
119. Species Phormidium nemuroense (Yoneda) I.Umezaki & M.Watanabe, 1994
120. Species Phormidium nigroviride (Thwaites ex Gomont) Anagnostidis & Komárek, 1988
121. Species Phormidium nigrum (Vaucher ex Gomont) Anagnostidis & Komárek, 1988
122. Species Phormidium numarium Playfair, 1918
123. Species Phormidium olivascens Frémy, 1930
124. Species Phormidium pachydermaticum Frémy, 1930
125. Species Phormidium paludosum C.-C.Jao & Y.Y.Li, 1974
126. Species Phormidium papyraceum Gomont ex Gomont, 1892
127. Species Phormidium paucigranatum (Brühl & Biswas) Anagnostidis & Komárek, 1988
128. Species Phormidium paulsenianum J.B.Petersen, 1930
129. Species Phormidium pseudocortianum (Starmach) Anagnostidis, 2001
130. Species Phormidium pseudo-okeni Turicchia, Ventura, Komárková & Komárek, 2009
131. Species Phormidium pseudopriestleyi Anagnostidis & Komárek, 1988
132. Species Phormidium pulvinatum Woronichin, 1923
133. Species Phormidium puteale (Montagne ex Gomont) Anagnostidis & Komárek, 1988
134. Species Phormidium racovitzae De Wildeman, 1935
135. Species Phormidium raoi P.A.C.Senna & P.Compère, 1998
136. Species Phormidium regelii (Skuja) Anagnostidis & Komárek, 1988
137. Species Phormidium retzii Kützing ex Gomont, 1892
138. Species Phormidium richardsii Drouet, 1942
139. Species Phormidium rimosum (Komárek) Anagnostidis & Komárek, 1988
140. Species Phormidium rivulare Kützing ex Gomont, 1892
141. Species Phormidium roseum (Batters) Anagnostidis, 2001
142. Species Phormidium rotundum S.C.Santra & U.C.Pal, 1992
143. Species Phormidium rubidum (Frémy) Anagnostidis & Komárek, 1988
144. Species Phormidium rubriterricola N.L.Gardner, 1927
145. Species Phormidium salinarum (Collins) Anagnostidis & Komárek, 1988
146. Species Phormidium schroederi (Borge) Anagnostidis & Komárek, 1988
147. Species Phormidium schroeteri (Hansgirg) Anagnostidis, 2001
148. Species Phormidium schultzii (Lemmermann) Anagnostidis & Komárek, 1988
149. Species Phormidium sinense Jao, 1939
150. Species Phormidium spirale Vasishta, 1962
151. Species Phormidium spirulinoides I.Umezaki & M.Watanabe, 1994
152. Species Phormidium spongicola Weber-van Bosse, 1926
153. Species Phormidium stagninum C.B.Rao, 1938
154. Species Phormidium stagninum Anagnostidis, 2001
155. Species Phormidium standleyi Drouet, 1942
156. Species Phormidium steyermarkii Drouet, 1942
157. Species Phormidium subfuscum Kützing ex Gomont, 1892
158. Species Phormidium subincrustatum Fritsch & M.F.Rich, 1929
159. Species Phormidium submembranaceum Kützng ex Gomont, 1892
160. Species Phormidium subspiroides (J.J.Copeland) I.Umezaki & M.Watanabe, 1994
161. Species Phormidium subterraneum J.Phillipson, 1935
162. Species Phormidium takyricum (Novichkova) O.N.Vinogradova, 2011
163. Species Phormidium tambii (Woronichin) Anagnostidis & Komárek, 1988
164. Species Phormidium tanganyikae (G.S.West) Anagnostidis & Komárek, 1988
165. Species Phormidium taylori (Drouet & Strickland) Anagnostidis, 2001
166. Species Phormidium terebriforme (C.Agardh ex Gomont) Anagnostidis & Komárek, 1988
167. Species Phormidium tergestinum (Rabenhorst ex Gomont) Anagnostidis & Komárek, 1988
168. Species Phormidium thermale V.Vouk, 1916
169. Species Phormidium thermobium Anagnostidis, 2001
170. Species Phormidium thermophilum Skuja, 1937
171. Species Phormidium thwaitesii I.Umezaki & M.Watanabe, 1994
172. Species Phormidium tinctorium Kützing ex Gomont, 1892
173. Species Phormidium toficola Gomont, 1892
174. Species Phormidium tortuosum (N.L.Gardner) Anagnostidis & Komárek, 1988
175. Species Phormidium truncicola S.L.Ghose, 1924
176. Species Phormidium tyrolense Kützing ex Gomont, 1892
177. Species Phormidium ulrichii (Prát) Anagnostidis & Komárek, 1988
178. Species Phormidium umbilicatum Gomont, 1892
179. Species Phormidium uncinatum Gomont ex Gomont, 1892
180. Species Phormidium unigranulatum (Kisselev) Anagnostidis & Komárek, 1988
181. Species Phormidium usteri Schmidle, 1904
182. Species Phormidium variabile Azevedo & C.L.Sant'Anna, 1993
183. Species Phormidium variabile (Wille) Anagnostidis & Komárek, 1988
184. Species Phormidium viride (Vaucher ex Gomont) Lemmermann, 1907
185. Species Phormidium viscosum Lemmermann, 1907
186. Species Phormidium willei (N.L.Gardner) Anagnostidis & Komárek, 1988
187. Species Phormidium woronichinii (Ponomareva) Anagnostidis, 2001
188. Species Phormidium yellowstonense Prát, 1929
189. Species Phormidium yuhuense (Yoneda) Anagnostidis & Komárek, 1988
190. Species Phormidium yuichii I.Umezaki & M.Watanabe, 1994
191. Species Phormidium acuminatum (Gomont) Anagnostidis & Komárek, 1988 accepted as Oxynema acuminatum (Gomont) Chatchawan, Komárek, Strunecky, Smarda & Peerapornpisal, 2012 (synonym)
192. Species Phormidium acutissimum (Kufferath) Anagnostidis & Komárek, 1988 accepted as Anagnostidinema acutissimum (Kufferath) Strunecký, Bohunická, J.R.Johansen & J.Komárek, 2017 (synonym)
193. Species Phormidium aerugineocaeruleum (Gomont) Anagnostidis & Komárek, 1988 accepted as Potamolinea aerugineo-caerulea (Gomont) M.D.Martins & L.H.Z.Branco, 2016
194. Species Phormidium africanum Lemmermann, 1911 accepted as Leptolyngbya africana (Lemmermann) Anagnostidis & Komárek, 1988 (synonym)
195. Species Phormidium amoenum Kützing ex Anagnostidis & Komárek, 1988 accepted as Microcoleus amoenus (Gomont) Strunecky, Komárek & J.R.Johansen, 2013 (synonym)
196. Species Phormidium amphibium (Gomont) Anagnostidis & Komárek, 1988 accepted as Anagnostidinema amphibium (C.Agardh ex Gomont) Strunecký, Bohunická, J.R.Johansen & J.Komárek, 2017 (synonym)
197. Species Phormidium anabaenoides C.-C.Jao & Y.-Y.Lee, 1974 accepted as Komvophoron anabaenoides (C.-C.Jao & Y.-Y.Li) Anagnostidis & Komárek, 1988 (synonym)
198. Species Phormidium angustissimum West & G.S.West, 1897 accepted as Leptolyngbya angustissima (West & G.S.West) Anagnostidis & Komárek, 1988 (synonym)
199. Species Phormidium animale (C.Agardh ex Gomont) Anagnostidis & Komárek, 1988 accepted as Kamptonema animale (C.Agardh ex Gomont) Strunecký, Komárek & J.Smarda, 2014
200. Species Phormidium anomalum C.B.Rao, 1937 accepted as Lyngbya anomala (C.B.Rao) Umezaki & Watanabe, 1994 (synonym)
201. Species Phormidium antarcticum West & G.S.West, 1911 accepted as Leptolyngbya antarctica (West & G.S.West) Anagnostidis & Komárek, 1988 (synonym)
202. Species Phormidium arcuatum Skuja, 1948 accepted as Pseudanabaena arcuata (Skuja) Anagnostidis & Komárek, 1988 (synonym)
203. Species Phormidium arenarium (Gomont) Rabenhorst ex Forti, 1907 accepted as Lyngbya arenaria (Gomont) Hansgirg, 1889 (synonym)
204. Species Phormidium attenuatum (F.E.Fritsch) Anagnostidis & Komárek, 1988 accepted as Microcoleus attenuatus (Fritsch) Strunecky, Komárek & J.R.Johansen, 2013
205. Species Phormidium autumnale Gomont, 1892 accepted as Microcoleus autumnalis (Gomont) Strunecky, Komárek & J.R.Johansen, 2013 (synonym)
206. Species Phormidium beggiatoiforme (Gomont) Anagnostidis & Komárek, 1988 accepted as Microcoleus beggiatoiformis (Gomont) Strunecky, Komárek & J.R.Johansen, 2013
207. Species Phormidium bigranulatum N.L.Gardner, 1926 accepted as Leptolyngbya bigranulata (N.L.Gardner) Anagnostidis & Komárek, 1988 (synonym)
208. Species Phormidium bijahense J.J.Copeland, 1936 accepted as Leptolyngbya bijahensis (J.J.Copeland) Anagnostidis, 2001 (synonym)
209. Species Phormidium bijugatum Kongisser, 1924 accepted as Nodosilinea bijugata (Kongisser) Perkerson & Kovácik, 2011 (synonym)
210. Species Phormidium boryanum Kützing ex Forti, 1907 accepted as (synonym)
211. Species Phormidium calidum Gomont ex Gomont, 1892 accepted as Microcoleus calidus (Gomont ex Gomont) Strunecky, Komárek & J.R.Johansen, 2013 (synonym)
212. Species Phormidium carotinosum (Geitler) Anagnostidis & Komárek, 1988 accepted as Geitlerinema carotinosum (Geitler) Anagnostidis, 1989 (synonym)
213. Species Phormidium cataractarum Rabenhorst, 1863 accepted as Leptolyngbya cataractarum (Hansgirg) Komárek, 2001 (synonym)
214. Species Phormidium caucasicum (Elenkin & Kossinskaja) Anagnostidis, 2001 accepted as Microcoleus caucasicus (Elenkin & Kosinskaja) Strunecky, Komárek & J.R.Johansen, 2013
215. Species Phormidium cebennense Gomont, 1899 accepted as Leptolyngbya cebennensis (Gomont) I.Umezaki & M.Watanabe, 1994 (synonym)
216. Species Phormidium chlorinum (Kützing ex Gomont) Umezaki & Watanabe, 1994 accepted as Kamptonema chlorinum (Kützing ex Gomont) Strunecký, Komárek & J.Smarda, 2014
217. Species Phormidium cincinnatum Itzigsohn, 1910 accepted as Lyngbya cincinata (Itzigsohn) Compère, 1985
218. Species Phormidium claricentrosum (Gardner) Anagnostidis & Komárek, 1988 accepted as Geitlerinema claricentrosum (N.L.Gardner) Anagnostidis, 1989 (synonym)
219. Species Phormidium congestum (P.Crouan & H.Crouan) Rabenhorst, 1865 accepted as Lyngbya congesta P.Crouan & H.Crouan ex Gomont, 1892 (synonym)
220. Species Phormidium corallinae (Gomont ex Gomont) Anagnostidis & Komárek, 1988 accepted as Oscillatoria corallinae Gomont, 1890
221. Species Phormidium corallyticum Rützler & Santavy, 1983 accepted as Roseofilum corallyticum (Rützler & Santavy) D.Casamatta, D.Stanic, M.Gantar & L.L.Richardson, 2012 (synonym)
222. Species Phormidium cortianum (Meneghini ex Gomont) Anagnostidis & Komárek, 1988 accepted as Kamptonema cortianum (Meneghini ex Gomont) Strunecký, Komárek & J.Smarda, 2014
223. Species Phormidium crosbyanum Tilden, 1909 accepted as Leptolyngbya crosbyana (Tilden) Anagnostidis & Komárek, 1988 (synonym)
224. Species Phormidium crustaceum Woronichin, 1932 accepted as Microcoleus crustaceus (Voronichin) Strunecky, Komárek & J.R.Johansen, 2013
225. Species Phormidium curtum Hollerbach, 1934 accepted as Pseudanabaena curta (Hollerbach) Cronberg & Komárek, 1994 (synonym)
226. Species Phormidium deflexum (West & G.S.West) Anagnostidis & Komárek, 1988 accepted as Anagnostidinema deflexum (West & G.S.West) Strunecky et al., 2017 (synonym)
227. Species Phormidium dictyothallum Skuja, 1948 accepted as Pseudanabaena dictyothalla (Skuja) Anagnostidis, 2001 (synonym)
228. Species Phormidium ectocarpi Gomont, 1899 accepted as Leptolyngbya ectocarpi (Gomont) Anagnostidis & Komárek, 1988 (synonym)
229. Species Phormidium endophyticum (West & G.S.West) Skuja, 1956 accepted as Anathece endophytica (W. & G.S. West) Komárek, Kastovsky & Jezberová, 2011
230. Species Phormidium epiphyticum N.L.Gardner, 1932 accepted as Lyngbya algicola Hoffmann, 1990 (synonym)
231. Species Phormidium ercegovicii Cado, 1958 accepted as Leptolyngbya ercegovicii (Cado) Anagnostidis & Komárek, 1988
232. Species Phormidium etoshii Dadheech, Casamatta, P.Casper & Krienitz, 2013 accepted as Laspinema etoshii (Dadheech, Casamatta, P.Casper & Krienitz) Heidari & Tauer, 2018
233. Species Phormidium fonticola Kützing ex Gomont, 1892 accepted as Microcoleus fonticola (Kirchner) Strunecky, Komárek & J.R.Johansen, 2013
234. Species Phormidium formosum (Bory ex Gomont) Anagnostidis & Komárek, 1988 accepted as Kamptonema formosum (Bory ex Gomont) Strunecký, Komárek & J.Smarda, 2014
235. Species Phormidium foveolarum Gomont, 1892 accepted as Leptolyngbya foveolarum (Gomont) Anagnostidis & Komárek, 1988 (synonym)
236. Species Phormidium fragile Gomont, 1893 accepted as Leptolyngbya fragilis (Gomont) Anagnostidis & Komárek, 1988 (synonym)
237. Species Phormidium franquetii Bourrelly, 1949 accepted as Pseudanabaena franquetii (Bourrelly) Bourrelly, 1970 (synonym)
238. Species Phormidium frigidum F.E.Fritsch, 1912 accepted as Stenomitos frigidus (F.E.Fritsch) Miscoe & J.R.Johansen, 2016 (synonym)
239. Species Phormidium gebhardtianum (Claus) Anagnostidis & Komárek, 1988 accepted as Kamptonema gebhardtianum (Claus) Strunecký, Komárek & J.Smarda, 2014
240. Species Phormidium gelatinicola Geitler, 1933 accepted as Leptolyngbya gelatinicola (Geitler) Anagnostidis, 2001 (synonym)
241. Species Phormidium gelatinosum Woronichin, 1923 accepted as Leptolyngbya gelatinosa (Woronichin) Anagnostidis & Komárek, 1988 (synonym)
242. Species Phormidium geysericola J.J.Copeland, 1936 accepted as Leptolyngbya geysericola (J.J.Copeland) Anagnostidis, 2001 (synonym)
243. Species Phormidium glaciale West & G.S.West, 1911 accepted as Leptolyngbya glacialis (West & G.S.West) Anagnostidis & Komárek, 1988 (synonym)
244. Species Phormidium gracile (Rabenhorst ex Gomont) Anagnostidis, 2001 accepted as Leibleinia gracilis (Rabenhorst ex Gomont) Anagnostidis & Komárek, 1988 (synonym)
245. Species Phormidium gracile Lindstedt, 1943 accepted as Leptolyngbya gracilis (Lindstedt) Anagnostidis & Komárek, 1988 (synonym)
246. Species Phormidium halophilum (Hansgirg ex Hansgirg) Anagnostidis & Komárek, 1988 accepted as Leptolyngbya halophila (Hansgirg) Anagnostidis & Komárek, 1988
247. Species Phormidium hendersonii Howe, 1918 accepted as Leptolyngbya hendersonii (Howe) Anagnostidis & Komárek, 1988 (synonym)
248. Species Phormidium hypersalinum Campbell & Golubic, 1985 accepted as Limnothrix hypersalina (Campbell & Golubic) Anagnostidis, 2001 (synonym)
249. Species Phormidium hypolimneticum S.E.Campbell, 1985 accepted as Leptolyngbya hypolimnetica (S.E.Campbell) Anagnostidis, 2001 (synonym)
250. Species Phormidium ionicum (Skuja) Anagnostidis & Komárek, 1988 accepted as Anagnostidinema ionicum (Skuja) Strunecky et al., 2017 (synonym)
251. Species Phormidium jasorvense (Vouk) Anagnostidis & Komárek, 1988 accepted as Kamptonema jasorvense (Vouk) Strunecký, Komárek & J.Smarda, 2014 (synonym)
252. Species Phormidium joannianum Kützing ex Gomont, 1892 accepted as Lyngbya joanniana (Kützing ex Gomont) Hansgirg, 1892 (synonym)
253. Species Phormidium julianum (Meneghini) Rabenhorst, 1865 accepted as Homoeothrix juliana (Bornet & Flahault ex Gomont) Kirchner, 1898 (synonym)
254. Species Phormidium koetzlitzi (F.E.Fritsch) Anagnostidis & Komárek, 1988 accepted as Oscillatoria koettlitzi F.E.Fritsch, 1912
255. Species Phormidium komarovii Anissimova, 1949 accepted as Leptolyngbya komarovii (Anissimova) Anagnostidis & Komárek, 1988 (synonym)
256. Species Phormidium konstantinosum I.Umezaki & M.Watanabe, 1994 accepted as Phormidium limosum (Dillwyn) P.C.Silva, 1996 accepted as Oscillatoria limosa C.Agardh ex Gomont, 1892 (synonym)
257. Species Phormidium koreanum G.S.An, 1992 accepted as Heteroleibleinia koreana (G.S.An) Anagnostidis, 2001 (synonym)
258. Species Phormidium kwangsiense Jao, 1944 accepted as Lyngbya kwangsiensis (C.-C.Jao) Anagnostidis, 2001 (synonym)
259. Species Phormidium laetevirens (P.Crouan & H.Crouan ex Gomont) Anagnostidis & Komárek, 1988 accepted as Kamptonema laetevirens (H.M.Crouan & P.L.Crouan ex Gomont) Strunecký, Komárek & J.Smarda, 2014
260. Species Phormidium laminosum Gomont ex Gomont, 1892 accepted as Leptolyngbya laminosa (Gomont ex Gomont) Anagnostidis & Komárek, 1988 (synonym)
261. Species Phormidium lapideum Geitler, 1933 accepted as Leptolyngbya lapidea (Geitler) Anagnostidis, 2001 (synonym)
262. Species Phormidium lignicola Frémy, 1930 accepted as Leptolyngbya lignicola (Frémy) Anagnostidis & Komárek, 1988 (synonym)
263. Species Phormidium limosum (Dillwyn) P.C.Silva, 1996 accepted as Oscillatoria limosa C.Agardh ex Gomont, 1892 (synonym)
264. Species Phormidium lloydianum (Gomont) Anagnostidis & Komárek, 1988 accepted as Oxynema lloydianum (Gomont) Chatchawan, Komárek, Strunecky, Smarda & Peerapornpisal, 2012 (synonym)
265. Species Phormidium lumbricale J.R.Johansen & Casamatta, 2005 accepted as Laspinema lumbricale (J.R.Johansen & Casamatta) Heidari & Hauer, 2018
266. Species Phormidium luridum Gomont, 1892 accepted as Drouetiella lurida (Gomont) Mai, J.R.Johansen & Pietrasiak, 2018 (synonym)
267. Species Phormidium majusculum (Dillwyn) Kützing, 1843 accepted as Lyngbya majuscula Harvey ex Gomont, 1892
268. Species Phormidium maraaense (Setchell) Anagnostidis & Komárek, 1988 accepted as Oscillatoria maraaensis Setchell, 1926
269. Species Phormidium martensianum (Meneghini ex Gomont) Anagnostidis & Komarek accepted as Lyngbya martensiana Meneghini ex Gomont, 1892
270. Species Phormidium meslinii (Frémy) Anagnostidis & Komárek, 1988 accepted as Oscillatoria meslini Frémy, 1930
271. Species Phormidium microtomum Skuja, 1949 accepted as Lyngbya microtoma (Skuja) Anagnostidis, 2001 (synonym)
272. Species Phormidium molle Gomont, 1892 accepted as Phormidesmis molle (Gomont) Turicchia, Ventura, Komárková & Komárek, 2009 (synonym)
273. Species Phormidium mucicola Nauman & Huber-Pestalozzi, 1929 accepted as Pseudanabaena mucicola (Naumann & Huber-Pestalozzi) Schwabe, 1964 (Basionym)
274. Species Phormidium mucosum N.L.Gardner, 1927 accepted as Leptolyngbya mucosa (N.L.Gardner) Anagnostidis & Komárek, 1988 (synonym)
275. Species Phormidium murrayi (West & G.S.West) Anagnostidis & Komárek, 1988 accepted as Wilmottia murrayi (West & G.S.West) Strunecký, Elster & Komárek, 2011 (synonym)
276. Species Phormidium mycoideum Frémy, 1935 accepted as Leptolyngbya mycoidea (Frémy) Anagnostidis, 2001 (synonym)
277. Species Phormidium natans (Gomont) P.A.C.Senna & P.Compère, 1998 accepted as Lyngbya natans Hansgirg, 1892
278. Species Phormidium neotenue G.Hällfors, 2004 accepted as Oscillatoria tenuis C.Agardh ex Gomont, 1892
279. Species Phormidium nostochoides C.-C.Jao, 1948 accepted as Leptolyngbya nostochoides (C.-C.Jao) Anagnostidis, 2001 (synonym)
280. Species Phormidium numidicum (Gomont) Anagnostidis & Komárek, 1988 accepted as Geitlerinema numidicum (Gomont) Anagnostidis, 1989 (synonym)
281. Species Phormidium obscurum Kützing, 1845 accepted as Phormidium kuetzingianum (Kirchner ex Hansgirg) Anagnostidis & Komárek, 1988
282. Species Phormidium okenii (C.Agardh ex Gomont) Anagnostidis & Komárek, 1988 accepted as Kamptonema okenii (C.Agardh ex Gomont) Strunecký, Komárek & J.Smarda, 2014
283. Species Phormidium orientale G.S.West, 1902 accepted as Leptolyngbya orientalis (G.S.West) Anagnostidis & Komárek, 1988 (synonym)
284. Species Phormidium ornatum (Kützing ex Gomont) Anagnostidis & Komárek, 1988 accepted as Oscillatoria ornata Kützing ex Gomont, 1892
285. Species Phormidium pannosum (Bory) Kützing, 1843 accepted as (synonym)
286. Species Phormidium papillaterminatum Kisselev, 1927 accepted as Pseudanabaena papillaterminata (Kiselev) Kukk, 1959 (synonym)
287. Species Phormidium pavlovskoënse Elenkin, 1949 accepted as Kamptonema pavlovskoënse (Elenkin) Anagnostidis & Komárek, 2014
288. Species Phormidium penicillatum Gomont, 1893 accepted as Caldora penicillata (Gomont) Engene, Tronholm & V.J.Paul, 2015
289. Species Phormidium persicinum Gomont, 1892 accepted as Pseudanabaena persicina (Reinke ex Gomont) Anagnostidis, 2001 (synonym)
290. Species Phormidium priestleyi F.E.Fritsch, 1917 (unaccepted)
291. Species Phormidium productum (West & G.S.West) Anagnostidis & Komárek, 1988 (unaccepted)
292. Species Phormidium proteus (Skuja) I.Umezaki & M.Watanabe, 1994 (unaccepted)
293. Species Phormidium pseudacutissimum (Geitler) Anagnostidis & Komárek, 1988 (unaccepted, synonym)
294. Species Phormidium pseudotenue Stockmayer & Skuja, 1937 (unaccepted, synonym)
295. Species Phormidium pseudovalderianum Woronichin, 1930 (unaccepted, synonym)
296. Species Phormidium purpurascens Gomont ex Gomont, 1892 (unaccepted, synonym)
297. Species Phormidium quadripunctulatum (Brühl & Biswas) N.L.Gardner, 1926 (unaccepted, synonym)
298. Species Phormidium ramosum J.B.Petersen, 1928 (unaccepted, synonym)
299. Species Phormidium rubrum Tilden, 1896 (unaccepted, synonym)
300. Species Phormidium rupestre (C.Agardh) Kützing, 1849 (unaccepted, synonym)
301. Species Phormidium rupicola (Hansgirg ex Gomont) Anagnostidis & Komárek, 1988 (unaccepted)
302. Species Phormidium schmidlei Anagnostidis & Komárek, 1988 (unaccepted)
303. Species Phormidium scytonematicola N.L.Gardner, 1927 (unaccepted, deleted in Algaebase)
304. Species Phormidium setchellianum Gomont, 1892 (unaccepted)
305. Species Phormidium simplicissimum (Gomont) Anagnostidis & Komárek, 1988 (unaccepted)
306. Species Phormidium spirale C.-C.Jao, 1948 (unaccepted, synonym)
307. Species Phormidium splendidum (Greville ex Gomont) Anagnostidis & Komárek, 1988 (unaccepted, synonym)
308. Species Phormidium spongeliae Gomont, 1892 (unaccepted, basionym)
309. Species Phormidium subcapitatum J.B.Petersen, 1923 (unaccepted, synonym)
310. Species Phormidium subhormoides G.S.An, 1992 (unaccepted, synonym)
311. Species Phormidium subproboscideum (West & G.S.West) Anagnostidis & Komárek, 1888 (unaccepted)
312. Species Phormidium subsalsum Gomont, 1899 (unaccepted, synonym)
313. Species Phormidium subterraneum J.J.Copeland, 1936 (unaccepted, synonym)
314. Species Phormidium subtilissimum Rabenhorst ex Levi-Morenos, 1892 (unaccepted, synonym)
315. Species Phormidium subtorulosum Brébisson, 1847 (unaccepted, synonym)
316. Species Phormidium subtruncatum Woronichin, 1930 (unaccepted, synonym)
317. Species Phormidium subuliforme (Thwaites ex Gomont) Anagnostidis & Komárek, 1988 (unaccepted)
318. Species Phormidium subuliforme Gomont, 1892 (unaccepted, synonym)
319. Species Phormidium tenue Gomont, 1892 (unaccepted, Synonym)
320. Species Phormidium tenuissimum Woronichin, 1930 (unaccepted, synonym)
321. Species Phormidium thermale Drouet, 1942 (unaccepted)
322. Species Phormidium treleasei Gomont, 1899 (unaccepted, synonym)
323. Species Phormidium truncatum Lemmermann, 1908 (unaccepted, synonym)
324. Species Phormidium tyrolense Kützing, 1849 (unaccepted, synonym)
325. Species Phormidium undosum Cado, 1958 (unaccepted)
326. Species Phormidium valderianum Gomont, 1892 (unaccepted, synonym)
327. Species Phormidium valesiacum Kützing, 1843 (unaccepted)
328. Species Phormidium versicolor Wartmann, 1865 (unaccepted, synonym)
329. Species Phormidium vesiculosum J.J.Copeland, 1936 (unaccepted, synonym)
330. Species Phormidium violaceum (Wallroth ex Gomont) Anagnostidis & Komárek, 1988 (unaccepted)
331. Species Phormidium vulgare Kützing, 1843 (unaccepted, synonym)
332. Species Phormidium weedii (Tilden) J.J.Copeland, 1936 (unaccepted)
333. Species Phormidium weissii Drouet, 1939 (unaccepted, synonym)
334. Species Phormidium welwitschii Grunow, 1865 (unaccepted, synonym)
335. Species Phormidium woronichinii Anisimova, 1949 (unaccepted, synonym)
336. Species Phormidium yonedae (I.Umezaki) I.Umezaki & M.Watanabe, 1994 (unaccepted)
337. Species Phormidium adspersum Roemer, 1845 (uncertain)
338. Species Phormidium aeruginosum Nägeli ex Kützing, 1849 (uncertain)
339. Species Phormidium amphibolum Rabenhorst, 1865 (uncertain)
340. Species Phormidium australe Kützing, 1843 (uncertain)
341. Species Phormidium bicolor Kützing, 1843 (uncertain)
342. Species Phormidium bryophilum Rabenhorst, 1878 (uncertain)
343. Species Phormidium canoviride Nägeli ex Kützing, 1849 (uncertain)
344. Species Phormidium coerulescens P.L.Crouan & H.M.Crouan, 1865 (uncertain)
345. Species Phormidium conspersum Meneghini ex Kützing, 1849 (uncertain)
346. Species Phormidium firmum Kützing, 1847 (uncertain)
347. Species Phormidium flexuosum Kützing, 1847 (uncertain)
348. Species Phormidium fuscoluteum Nägeli ex Kützing, 1849 (uncertain)
349. Species Phormidium irregulare A.Nash, 1938 (uncertain)
350. Species Phormidium kuetzingii Rabenhorst, 1865 (uncertain)
351. Species Phormidium margaritiferum Kützing, 1849 (uncertain)
352. Species Phormidium micoideum Frémy (uncertain)
353. Species Phormidium murale Kützing ex Roemer, 1845 (uncertain)
354. Species Phormidium muscorum (C.Agardh) Dalla Torre & Sarnthein, 1901 (uncertain, synonym)
355. Species Phormidium naegelianum Kützing, 1849 (uncertain)
356. Species Phormidium novae-zelandiae A.Nash, 1938 (uncertain)
357. Species Phormidium olivaceum Rabenhorst, 1865 (uncertain)
358. Species Phormidium oryzetorum Martens, 1870 (uncertain)
359. Species Phormidium parallelum Kützing, 1847 (uncertain)
360. Species Phormidium plicatum Kützing, 1849 (uncertain)
361. Species Phormidium rotheanum Itzigsohn, 1865 (uncertain)
362. Species Phormidium rotoruaeum A.Nash, 1938 (uncertain)
363. Species Phormidium rufescens Kützing, 1849 (uncertain)
364. Species Phormidium solitare Anagnostidis & Komárek, 1988 (uncertain, Unrevised species)
365. Species Phormidium spadiceum Kützing, 1843 (uncertain)
366. Species Phormidium woronichianum (Woronichin) Elenkin (uncertain, uncertain taxonomic status subjected to verification)

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