1. Species Phormidium azoricum O.C.Schmidt, 1931
2. Species Phormidium baculum (Gomont ex Gomont) Anagnostidis, 2001
3. Species Phormidium beccarianum (Gomont ex Forti) Anagnostidis & Komárek, 1988
4. Species Phormidium calciphilum I.Umezaki, 1995
5. Species Phormidium chalybeum (Mertens ex Gomont) Anagnostidis & Komárek, 1988
6. Species Phormidium constrictum Klas, 1938
7. Species Phormidium deflexoides (Elenkin & Kossinskaja) Anagnostidis & Komárek, 1988
8. Species Phormidium dimorphum Lemmermann, 1908
9. Species Phormidium endolithicum Ercegovic, 1932
10. Species Phormidium endospongeliae I.Umezaki, 1995
11. Species Phormidium feldmannii Frémy, 1937
12. Species Phormidium fuellebornii Schmidle, 1902
13. Species Phormidium gardnerianum Drouet, 1942
14. Species Phormidium hancockii (Drouet) Drouet, 1942
15. Species Phormidium hormoides Setchell & N.L.Gardner, 1918
16. Species Phormidium hydrocoleoides Drouet, 1942
17. Species Phormidium litorale Golubic, 1960
18. Species Phormidium minimum O.C.Schmidt, 1931
19. Species Phormidium minutum Skvortsov, 1937
20. Species Phormidium minutum Lindstedt, 1943
21. Species Phormidium monile Setchell & N.L.Gardner, 1930
22. Species Phormidium nigroviride (Thwaites ex Gomont) Anagnostidis & Komárek, 1988
23. Species Phormidium racovitzae De Wildeman, 1935
24. Species Phormidium roseum (Batters) Anagnostidis, 2001
25. Species Phormidium salinarum (Collins) Anagnostidis & Komárek, 1988
26. Species Phormidium schultzii (Lemmermann) Anagnostidis & Komárek, 1988
27. Species Phormidium spongicola Weber-van Bosse, 1926
28. Species Phormidium stagninum Anagnostidis, 2001
29. Species Phormidium submembranaceum Kützng ex Gomont, 1892
30. Species Phormidium thwaitesii I.Umezaki & M.Watanabe, 1994
31. Species Phormidium uncinatum Gomont ex Gomont, 1892
32. Species Phormidium amoenum Kützing ex Anagnostidis & Komárek, 1988 accepted as Microcoleus amoenus (Gomont) Strunecky, Komárek & J.R.Johansen, 2013 (synonym)
33. Species Phormidium angustissimum West & G.S.West, 1897 accepted as Leptolyngbya angustissima (West & G.S.West) Anagnostidis & Komárek, 1988 (synonym)
34. Species Phormidium arenarium (Gomont) Rabenhorst ex Forti, 1907 accepted as Lyngbya arenaria (Gomont) Hansgirg, 1889 (synonym)
35. Species Phormidium corallinae (Gomont ex Gomont) Anagnostidis & Komárek, 1988 accepted as Oscillatoria corallinae Gomont, 1890
36. Species Phormidium corallyticum Rützler & Santavy, 1983 accepted as Roseofilum corallyticum (Rützler & Santavy) D.Casamatta, D.Stanic, M.Gantar & L.L.Richardson, 2012 (synonym)
37. Species Phormidium crosbyanum Tilden, 1909 accepted as Leptolyngbya crosbyana (Tilden) Anagnostidis & Komárek, 1988 (synonym)
38. Species Phormidium deflexum (West & G.S.West) Anagnostidis & Komárek, 1988 accepted as Anagnostidinema deflexum (West & G.S.West) Strunecky et al., 2017 (synonym)
39. Species Phormidium ectocarpi Gomont, 1899 accepted as Leptolyngbya ectocarpi (Gomont) Anagnostidis & Komárek, 1988 (synonym)
40. Species Phormidium epiphyticum N.L.Gardner, 1932 accepted as Lyngbya algicola Hoffmann, 1990 (synonym)
41. Species Phormidium ercegovicii Cado, 1958 accepted as Leptolyngbya ercegovicii (Cado) Anagnostidis & Komárek, 1988
42. Species Phormidium fragile Gomont, 1893 accepted as Leptolyngbya fragilis (Gomont) Anagnostidis & Komárek, 1988 (synonym)
43. Species Phormidium gracile (Rabenhorst ex Gomont) Anagnostidis, 2001 accepted as Leibleinia gracilis (Rabenhorst ex Gomont) Anagnostidis & Komárek, 1988 (synonym)
44. Species Phormidium gracile Lindstedt, 1943 accepted as Leptolyngbya gracilis (Lindstedt) Anagnostidis & Komárek, 1988 (synonym)
45. Species Phormidium halophilum (Hansgirg ex Hansgirg) Anagnostidis & Komárek, 1988 accepted as Leptolyngbya halophila (Hansgirg) Anagnostidis & Komárek, 1988
46. Species Phormidium hendersonii Howe, 1918 accepted as Leptolyngbya hendersonii (Howe) Anagnostidis & Komárek, 1988 (synonym)
47. Species Phormidium hypersalinum Campbell & Golubic, 1985 accepted as Limnothrix hypersalina (Campbell & Golubic) Anagnostidis, 2001 (synonym)
48. Species Phormidium hypolimneticum S.E.Campbell, 1985 accepted as Leptolyngbya hypolimnetica (S.E.Campbell) Anagnostidis, 2001 (synonym)
49. Species Phormidium komarovii Anissimova, 1949 accepted as Leptolyngbya komarovii (Anissimova) Anagnostidis & Komárek, 1988 (synonym)
50. 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)
51. Species Phormidium limosum (Dillwyn) P.C.Silva, 1996 accepted as Oscillatoria limosa C.Agardh ex Gomont, 1892 (synonym)
52. Species Phormidium lloydianum (Gomont) Anagnostidis & Komárek, 1988 accepted as Oxynema lloydianum (Gomont) Chatchawan, Komárek, Strunecky, Smarda & Peerapornpisal, 2012 (synonym)
53. Species Phormidium majusculum (Dillwyn) Kützing, 1843 accepted as Lyngbya majuscula Harvey ex Gomont, 1892
54. Species Phormidium mycoideum Frémy, 1935 accepted as Leptolyngbya mycoidea (Frémy) Anagnostidis, 2001 (synonym)
55. Species Phormidium nostochoides C.-C.Jao, 1948 accepted as Leptolyngbya nostochoides (C.-C.Jao) Anagnostidis, 2001 (synonym)
56. Species Phormidium penicillatum Gomont, 1893 accepted as Caldora penicillata (Gomont) Engene, Tronholm & V.J.Paul, 2015
57. Species Phormidium persicinum Gomont, 1892 accepted as Pseudanabaena persicina (Reinke ex Gomont) Anagnostidis, 2001 (synonym)
58. Species Phormidium priestleyi F.E.Fritsch, 1917 accepted as Phormidesmis priestleyi (F.E.Fritsch) Komárek, Kastovský, Ventura, Turicchia & Smarda, 2009
59. Species Phormidium spirale C.-C.Jao, 1948 accepted as Leptolyngbya spiralis (C.-C.Jao) Anagnostidis, 2001 (synonym)
60. Species Phormidium spongeliae Gomont, 1892 accepted as Hormoscilla feldmannii Anagnostidis, 2001 (basionym)
61. Species Phormidium subsalsum Gomont, 1899 accepted as Microcoleus subsalsus (Gomont) Strunecky, Komárek & Johansen, 2013 (synonym)
62. Species Phormidium subuliforme (Thwaites ex Gomont) Anagnostidis & Komárek, 1988 accepted as Phormidium thwaitesii I.Umezaki & M.Watanabe, 1994
63. Species Phormidium subuliforme Gomont, 1892 accepted as Leptolyngbya subuliformis (Gomont) Anagnostidis, 2001 (synonym)
64. Species Phormidium versicolor Wartmann, 1865 accepted as Porphyrosiphon versicolor (Gomont) Anagnostidis & Komárek, 1988 (synonym)
65. Species Phormidium weissii Drouet, 1939 accepted as Leptolyngbya weissii (Drouet) Anagnostidis, 2001 (synonym)
66. Species Phormidium woronichinii Anisimova, 1949 accepted as Leptolyngbya woronichinii (Anissimova) Anagnostidis & Komárek, 1988 (synonym)
67. Species Phormidium yonedae (I.Umezaki) I.Umezaki & M.Watanabe, 1994 accepted as Oscillatoria yonedae I.Umezaki, 1961
68. Species Phormidium bicolor Kützing, 1843 (uncertain)
69. Species Phormidium coerulescens P.L.Crouan & H.M.Crouan, 1865 (uncertain)
70. Species Phormidium micoideum Frémy (uncertain)

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