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References

For Ophioglossum

Lellinger, D.B. 1985. A field manual of the ferns and fern allies of the United States and Canada. Smithsonian Institution Press, Washington, D.C. Google Scholar

Liu & Sahashi. 2013. In FoC. Google Scholar

PPG I. 2016. A community-derived classification for extant lycophytes and ferns. J. Syst. Evol. Google Scholar

Wagner, W.H., Jr., and F.S. Wagner. 1993. Ophioglossaceae. 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. Google Scholar

Wagner. 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. Google Scholar

Wan, X., L. Zhang, and L.-B. Zhang. 2022. Validation and lectotypification of the fern combination Whittieria engelmannii (Ophioglossaceae). Phytotaxa 567(2): 205-206. Google Scholar

Zhang, L., and L.-B. Zhang. 2022. Phylogeny, character evolution, and systematics of the fern family Ophioglossaceae based on Sanger sequence data, plastomes, and morphology. Molec. Syst. Evol. 173: 107512. Google Scholar

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