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CCDB → Bryophytes → Brachytheciaceae → Isothecium
| Taxon name | Status | Median (n) |
| Isothecium alopecuroides (Lam.) Isov. | Accepted | 11 |
| Isothecium hakkodense Besch. | Accepted | 10 |
| Isothecium myosuroides Brid. | Accepted | 11 |
| Isothecium spiculiferum (Mitt.) Macoun & Kindb. | Accepted | 10 |
| Isothecium striatulum (Spruce) Kindb. | Accepted | 11 |
| Isothecium myurum Brid. | Synonym of Isothecium alopecuroides (Lam.) Isov. | 11 |
| Isothecium stoloniferum Brid. | Synonym of Isothecium myosuroides Brid. | 11 |