For Cryptogramma
Alverson, E.R. 1993. Cryptogramma. 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.
Metzgar, J.S., E.R. Alverson, S. Chen, A.V. Vaganov, and S.M. Ickert-Bond. 2013. Diversification and reticulation in the circumboreal fern genus Cryptogramma. Molec. Phylogen. & Evol. 67: 589-599.
Tryon, Tryon, & 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.
Zhang, Alverson, & Metzgar. 2013. In FoC.
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