1. Species Microstomum afzelii Atherton & Jondelius, 2019
2. Species Microstomum album (Attems, 1897)
3. Species Microstomum artoisi Atherton & Jondelius, 2018
4. Species Microstomum bioculatum Faubel, 1984
5. Species Microstomum bispiralis Stirewalt, 1937
6. Species Microstomum breviceps Marcus, 1951
7. Species Microstomum caerulescens Graff, 1882
8. Species Microstomum caerulescens (Schmarda, 1859) Graff, 1882
9. Species Microstomum canum Fuhrmann, 1894
10. Species Microstomum compositum (Metschnikoff, 1861)
11. Species Microstomum crildensis Faubel, 1984
12. Species Microstomum curinigalletti Atherton & Jondelius, 2019
13. Species Microstomum davenporti Graff, 1911
14. Species Microstomum dermophthalmum Riedel, 1932
15. Species Microstomum edmondi Atherton & Jondelius, 2018
16. Species Microstomum gabriellae Marcus, 1950
17. Species Microstomum inexcultus Atherton & Jondelius, 2019
18. Species Microstomum jenseni Riedel, 1932
19. Species Microstomum laurae Atherton & Jondelius, 2018
20. Species Microstomum lineare (Müller OF, 1773)
21. Species Microstomum littorale Ørsted, 1845
22. Species Microstomum lotti Atherton & Jondelius, 2019
23. Species Microstomum lucidum Fuhrmann, 1898
24. Species Microstomum marisrubri Atherton & Jondelius, 2019
25. Species Microstomum melanophthalmum Steinböck, 1933
26. Species Microstomum mortenseni Riedel, 1932
27. Species Microstomum mundum Graff, 1905
28. Species Microstomum ornatum Uljanin, 1870
29. Species Microstomum papillosum Graff, 1882
30. Species Microstomum paradii Graff, 1913
31. Species Microstomum philadelphicum Leidy, 1852
32. Species Microstomum proliferum (Busch, 1851)
33. Species Microstomum punctatum Dorner, 1902
34. Species Microstomum rhabdotum Marcus, 1951
35. Species Microstomum rogozini Timoshkin & Krivorotkin, 2023
36. Species Microstomum rubromaculatum Graff, 1882
37. Species Microstomum schultei Atherton & Jondelius, 2019
38. Species Microstomum semicirculare Armonies, 2023
39. Species Microstomum septentrionale Sabussow, 1900
40. Species Microstomum sinensis Wang & Lin, 2017
41. Species Microstomum spiculifer Faubel, 1974
42. Species Microstomum spirale Armonies, 2023
43. Species Microstomum spiriferum Westblad, 1953
44. Species Microstomum tchaikovskyi Atherton & Jondelius, 2018
45. Species Microstomum trichotum Marcus, 1950
46. Species Microstomum ulum Marcus, 1950
47. Species Microstomum weberi Atherton & Jondelius, 2019
48. Species Microstomum zicklerorum Atherton & Jondelius, 2018
49. Species Microstomum achroophthalmum Diesing, 1862 accepted as Stenostomum unicolor Schmidt, 1848 accepted as Stenostomum sphagnetorum Papi, 1960 (unaccepted > junior subjective synonym)
50. Species Microstomum caudatum Leidy, 1852 accepted as Microstomum lineare (Müller OF, 1773)
51. Species Microstomum coerulescens accepted as Microstomum caerulescens (Schmarda, 1859) Graff, 1882 (unaccepted > misspelling - incorrect subsequent spelling)
52. Species Microstomum diplolethicum Steinböck, 1931 (unaccepted > nomen nudum, nomen nudum)
53. Species Microstomum giganteum Hallez, 1878 accepted as Microstomum lineare (Müller OF, 1773)
54. Species Microstomum hamatum Westblad, 1953 accepted as Microstomum lucidum Fuhrmann, 1898 (junior synonym)
55. Species Microstomum inerme Zacharias, 1894 accepted as Microstomum lineare (Müller OF, 1773)
56. Species Microstomum leucops Ørsted, 1844 accepted as Stenostomum leucops (Duges, 1828) Schmidt, 1848
57. Species Microstomum tortipenis Steinböck, 1938 accepted as Microstomum jenseni Riedel, 1932
58. Species Microstomum unicolor Diesing, 1862 accepted as Stenostomum unicolor Schmidt, 1848 accepted as Stenostomum sphagnetorum Papi, 1960 (Junior synonym)
59. Species Microstomum groenlandicum Levinsen, 1879 (uncertain > taxon inquirendum)
60. Species Microstomum variabile Leidy, 1851 (uncertain > nomen dubium, nomen dubium)

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