1. Species Monostroma alittorale T.Tanaka & K.Nozawa, 1963
2. Species Monostroma angicava Kjellman, 1883
3. Species Monostroma antarcticum V.J.Chapman, 1956
4. Species Monostroma balticum Wittrock, 1866
5. Species Monostroma bullosum (Roth) Thuret, 1854
6. Species Monostroma crassidermum Tokida, 1954
7. Species Monostroma crassissimum Iwamoto, 1960
8. Species Monostroma crassiusculum Kjellman, 1889
9. Species Monostroma dactyliferum W.R.Taylor, 1945
10. Species Monostroma ecuadoreanum W.R.Taylor, 1945
11. Species Monostroma expansa G.S.West
12. Species Monostroma fractum C.-C.Jao, 1937
13. Species Monostroma grevillei (Thuret) Wittrock, 1866
14. Species Monostroma hariotii Gain, 1911
15. Species Monostroma kuroshiense F.Bast, 2015
16. Species Monostroma latissimum Wittrock, 1866
17. Species Monostroma lindaueri V.J.Chapman, 1940
18. Species Monostroma lubricum Kjellman, 1877
19. Species Monostroma moorei V.J.Chapman, 1956
20. Species Monostroma mundum Kjellman, 1893
21. Species Monostroma nitidum Wittrock, 1866
22. Species Monostroma ochotensis Nagai, 1940
23. Species Monostroma pacificum V.J.Chapman, 1956
24. Species Monostroma parvulum P.L.Crouan & H.M.Crouan, 1860
25. Species Monostroma parvum V.J.Chapman, 1956
26. Species Monostroma quaternarium (Kützing) Desmazières, 1859
27. Species Monostroma saccodeum Kjellman, 1883
28. Species Monostroma sandei Weber-van Bosse, 1913
29. Species Monostroma tubulosum L.Luan & R.Ding, 2013
30. Species Monostroma applanatum Gain, 1911 accepted as Antarctosaccion applanatum (Gain) Delépine, 1970 (synonym)
31. Species Monostroma arcticum Wittrock, 1866 accepted as Monostroma grevillei var. arcticum (Wittrock) Rosenvinge, 1893 (synonym)
32. Species Monostroma areolatum Setchell & N.L.Gardner, 1920 accepted as Protomonostroma undulatum (Wittrock) K.L.Vinogradova, 1969 (synonym)
33. Species Monostroma blytii Wittrock accepted as Monostroma blyttii (Areschoug) Wittrock, 1866 accepted as Monostroma obscurum (Kützing) J.Agardh, 1883 accepted as Ulvaria obscura (Kützing) P.Gayral ex C.Bliding, 1969
34. Species Monostroma blyttii (Areschoug) Wittrock, 1866 accepted as Monostroma obscurum (Kützing) J.Agardh, 1883 accepted as Ulvaria obscura (Kützing) P.Gayral ex C.Bliding, 1969 (synonym)
35. Species Monostroma crepidinium Farlow, 1881 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al., 1989 (synonym)
36. Species Monostroma endiviifolium A.Gepp & E.S.Gepp, 1905 accepted as Pyropia endiviifolia (A.Gepp & E.Gepp) H.G.Choi & M.S.Hwang, 2011 (synonym)
37. Species Monostroma fuscum Wittrock, 1866 accepted as Ulvaria splendens (Ruprecht) K.L.Vinogradova, 1979 (synonym)
38. Species Monostroma groenlandicum J.Agardh, 1883 accepted as Pseudothrix groenlandica (J.Agardh) Hanic & S.C.Lindstrom, 2008 (synonym)
39. Species Monostroma helgolandicum Schmidt accepted as Kornmannia leptoderma (Kjellman) Bliding, 1969 (synonym)
40. Species Monostroma laceratum Thuret accepted as Monostroma oxyspermum var. laceratum (Thuret) Hamel (synonym)
41. Species Monostroma lactuca (Linnaeus) J.Agardh, 1883 accepted as Ulva lactuca Linnaeus, 1753
42. Species Monostroma leptodermum Kjellman, 1877 accepted as Kornmannia leptoderma (Kjellman) Bliding, 1969 (synonym)
43. Species Monostroma obscurum (Kützing) J.Agardh, 1883 accepted as Ulvaria obscura (Kützing) P.Gayral ex C.Bliding, 1969 (synonym)
44. Species Monostroma orbiculatum Thuret, 1854 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al., 1989 (synonym)
45. Species Monostroma oxycoccum Thuret, 1854 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al., 1989 (synonym)
46. Species Monostroma oxyspermum (Kützing) Doty, 1947 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al., 1989
47. Species Monostroma pulchrum Farlow, 1881 accepted as Protomonostroma undulatum f. pulchrum (Farlow) M.J.Wynne, 1986
48. Species Monostroma splendens (Ruprecht) Wittrock, 1866 accepted as Ulvaria fusca (Wittrock) Vinogradova, 1967 accepted as Ulvaria splendens (Ruprecht) K.L.Vinogradova, 1979 (synonym)
49. Species Monostroma tubiforme Iwamoto, 1960 accepted as Gayralia oxysperma (Kützing) K.L.Vinogradova ex Scagel et al., 1989 (synonym)
50. Species Monostroma undulatum Wittrock, 1866 accepted as Protomonostroma undulatum (Wittrock) K.L.Vinogradova, 1969 (synonym)
51. Species Monostroma wittrockii Bornet, 1880 accepted as Gayralia oxysperma f. wittrockii (Bornet) P.C.Silva, 1996 (synonym)
52. Species Monostroma zostericola Tilden, 1900 accepted as Kornmannia zostericola (Tilden) Bliding, 1969 accepted as Kornmannia leptoderma (Kjellman) Bliding, 1969 (synonym)

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