For Cystopteris
Ekrt, L., J. Košnar, C.J. Rothfels, K. Hanušová, O. Hornych, and T. Urfus. 2022. Cytogenetic, geographical, spore type and plastid haplotype data reveal cryptic patterns of species diversity in the cosmopolitan Cystopteris fragilis complex (Polypodiopsida: Cystopteridaceae). Bot. J. Linn. Soc.
Haufler, C.H., R.C. Moran, and M.D. Windham. 1993. Cystopteris. 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., M.D. Windham, and T.A. Ranker. 1990. Biosystematic analysis of the Cystopteris tennesseensis (Dryopteridaceae) Complex. Ann. Missouri Bot. Gard. 77: 314-329.
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.
Rothfels, C.J., A.K. Johnson, M.D. Windham, and K.M. Pryer. 2014. Low-copy nuclear data confirm rampant allopolyploidy in the Cystopteridaceae (Polypodiales). Taxon 63: 1026-1036.
Shmakov, A.I., A.A. Batkin, and A.V. Vaganov. 2018. Synopsis of the genus Cystopteris Bernh. (Cystopteridaceae) . Ukrainian J. Ecol. 8: 290-297.
Wang & Haufler. 2013. In FoC.
Windham, M.D., and K.M. Pryer. 2022. First report of Utah fragile fern (Cystopteris: Cystopteridaceae) from New Mexico, and new nomenclatural combinations in Cystopteris tennesseensis. J. Bot. Res. Inst. Texas 16(1): 1-7.
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