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Osmunda wehrii
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| Newly discovered pinnules of O. wehrii with distinctive, taxonomically significant morphological features support its close relationship to Osmunda regalis and O. japonica of Osmunda subgenus Osmunda |
| Miller, C. N., Jr. 1982. Osmunda wehrii, a new species based on petrified rhizomes from the Miocene of Washington. American Journal of Botany 69: 116-121. |
| Pigg, K. B., M. L. DeVore and W. C. Wehr. 2005. Filicalean ferns from the Tertiary of western North America: Osmunda L. (Osmundaceae: Pteridophyta), Woodwardia Sm. (Blechnaceae: Petridophyta), and onocleoid ferms (Filicales: Pteridophyta). Fern Gazette: submitted. |