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For Botrypus

Hauk, W.D., C.R. Parks, and M.W. Chase. 2003. Phylogenetic studies of Ophioglossaceae: evidence from rbcL and trnL-F plastid DNA sequences and morphology. Molec. Phylogen. Evol. 28: 131-151.

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

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.

Zhang & Sahashi in FoC (2013)

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.

Zhang, L., X.‐P. Fan, S. Petchsri, L. Zhou, R. Pollawatn, X. Zhang, X.‐M. Zhou, N.T. Lu, R. Knapp, S. Chantanaorrapint, P. Limpanasittichai, H. Sun, X.‐F. Gao, and L.‐B. Zhang. 2020. Evolutionary relationships of the ancient fern lineage the adder's tongues (Ophioglossaceae) with description of Sahashia gen. nov. Cladistics 36: 380-393.

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