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CCDB → Bryophytes → Thuidiaceae → Haplocladium
| Taxon name | Status | Median (n) |
| Haplocladium microphyllum (Hedw.) Broth. | Accepted | 10 |
| Haplocladium microphyllum subsp. capillatum (Mitt.) Reimers | Accepted | 11 |
| Haplocladium microphyllum subsp. virginianum (Brid.) Reimers | Accepted | 10 |
| Haplocladium strictulum (Cardot) Reimers | Accepted | 11 |
| Haplocladium subulaceum (Mitt.) Broth. | Accepted | 10 |
| Haplocladium subulaceum var. subulatum (Cardot) Thér. | Accepted | 10 |
| Haplocladium virginianum (Brid.) Broth. | Accepted | 11 |
| Bryohaplocladium microphyllum (Hedw.) R. Watan. & Z. Iwats. | Synonym of Haplocladium microphyllum (Hedw.) Broth. | 10 |
| Haplocladium capillatum (Mitt.) Broth. | Synonym of Haplocladium microphyllum (Hedw.) Broth. | 10 |
| Haplocladium subulatum Cardot | Synonym of Haplocladium subulaceum var. subulatum (Cardot) Thér. | 10 |