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CCDB → Pteridophytes → Lycopodiaceae → Diphasium
| Taxon name | Status | Median (n) |
| Diphasium sitchense Á. Löve & D. Löve | Synonym of Diphasiastrum sitchense (Rupr.) Holub | 23 |
| Diphasium issleri Holub | Synonym of Diphasiastrum à issleri (Rouy) Holub | 23 |
| Diphasium zeileri (Rouy) Damboldt | Synonym of Diphasiastrum à zeilleri (Rouy) Holub | 23 |
| Lycopodium scariosum Forst. | Synonym of Diphasium scariosum (Forst.) Rothm. | 30 |
| Diphasium alpinum (L.) Rothm. | Synonym of Lycopodium alpinum L. | 24 |
| Diphasium complanatum (L.) Rothm. | Synonym of Lycopodium complanatum L. | 23 |
| Diphasium jussiaei (Desv.) Rothm. | Synonym of Lycopodium jussiaei Desv. ex Poir. | 17 |