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Wessiea yakimaensis
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| Pigg, K. B., and G. W. Rothwell. 2001. Anatomically preserved Woodwardia virginica (Blechnaceae) and a new filicalean fern from the middle Miocene Yakima Canyon flora of central Washington, USA. Amer. J. Bot. 88:777-787. http://www.amjbot.org |