|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.
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