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CCDB → Pteridophytes → Osmundaceae → Plenasium
| Taxon name | Status | Median (n) |
| Plenasium banksiaefolium (C. Presl) C. Presl | Synonym of Osmunda banksiifolia var. bromeliifolia (C. Presl) Kuhn | 22 |
| Osmunda javanica Blume | Synonym of Plenasium javanicum (Blume) C. Presl | 22 |
| Osmunda javanica Blume | Synonym of Plenasium javanicum (Blume) C. Presl | 22 |