Project 2691: N. A. Jud, G. W. Rothwell, R. A. Stockey. 2008. Todea from the Lower Cretaceous of western North America: implications for the phylogeny, systematics, and evolution of modern Osmundaceae. American Journal of Botany. 95 (3):330-339.
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M451548
† Todea tidwellii Jud Rothwell...
transverse section