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References

For Polypodium

Bryan, F.A., and D.E. Soltis. 1987. Electrophoretic evidence for allopolyploidy in the fern Polypodium virginianum. Systematic Bot. 12: 553-561.

Cusick, A.W. 2002. A binomial for the hybrid Polypodium of eastern North America. Amer. Fern J. 92: 240-241.

Haufler, C.H., M.D. Windham, F.A. Lang, and S.A. Whitmore. 1993. Polypodium. In Flora of North America Editorial Committee. 1993b. Flora of North America north of Mexico. Volume 2, pteridophytes and gymnosperms. Oxford Univ. Press, New York, NY. 475 pp.

Haufler, C.M., and M.D. Windham. 1991. New species of North American Cystopteris and Polypodium, with comments on their reticulate relationships. Amer. Fern J. 81: 7-23.

Haufler, C.M., M.D. Windham, and E.W. Rabe. 1995. Reticulate evolution in the Polypodium vulgare complex. Systematic Bot. 20: 89-109.

Hennipman, Veldhoen, & Kramer. 1990. In Kramer, K.U., and P.S. Green. 1990. Pteridophytes and Gymnosperms. In K. Kubitzki, ed., The families and genera of vascular plants. Springer-Verlag, Berlin.

Kott, L.S., and D.M. Britton. 1982. A comparative study of sporophyte morphology of three cytotypes of Polypodium virginianum in Ontario. Can. J. Bot. 60: 1360-1370.

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