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CCDB → Bryophytes → Orthotrichaceae → Micromitrium
| Taxon name | Status | Median (n) |
| Micromitrium megalosporum Austin | Accepted | 22 |
| Ephemerum megalosporum (Austin) E. S. Salmon | Synonym of Micromitrium megalosporum Austin | 22 |
| Nanomitrium megalosporum (Austin) E. Britton | Synonym of Micromitrium megalosporum Austin | 22 |
| Micromitrium austinii Sull. | Synonym of Micromitrium tenerum (Bruch & Schimp.) Crosby | 10 |
| Nanomitrium austinii (Sull.) Lindb. | Synonym of Micromitrium tenerum (Bruch & Schimp.) Crosby | 10 |