water fern

plural water ferns

1. Any fern of a number of taxonomic groups:
   1. Salviniales, an order of aquatic ferns
   2. Austroblechnum lanceolatum (syn. Blechnum chambersii; lance water fern)
   3. Austroblechnum patersonii (syn. Blechnum patersonii; strap water fern)
   4. Austroblechnum penna-marina (syn. Blechnum penna-marina; alpine water fern)
   5. Azolla filiculoides (Pacific mosquitofern)
   6. Bolbitis heudelotii (African water fern)
   7. Cranfillia fluviatilis (syn. Blechnum fluviatile; ray water fern)
   8. Histiopteris incisa (bat's wing fern, oak fern)
   9. Lomaria nuda (syn. Blechnum nudum; fishbone water fern)
   10. Oceaniopteris cartilaginea (syn. Blechnum cartilagineum; soft water fern)
   11. Osmunda regalis (royal fern)
   12. Parablechnum wattsii (syn. Blechnum wattsii) (hard water fern)
   13. Regnellidium diphyllum (two-leaf water fern)
   14. Salvinia molesta (giant water fern)
   15. Telmatoblechnum indicum (syn. Blechnum indicum; swamp water fern)