| Royal Fern (Osmunda regalis) Linnaeus 1753 |
| Synonyms: Osmunda spectabilis, Aphyllocalpa regalis, Osmunda longifolia, Osmunda mexicana, Osmunda obtusifolia, Osmunda palmeri, Osmunda palustris, Osmunda schelpei, Osmunda transvaalensis, Struthiopteris regalis |
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Osmunda regalis grows in riverine habitats and bogs in Eurasia, Africa and eastern North America. The fronds of this species can exceed one meter in length. Some botanists treat the royal fern of North America as a separate species, Osmunda spectabilis.
