Verbatim text: Haufler, C. H. 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.
Author: Haufler, C.H., Windham, M.D.
Year: 1991
Title: New species of North American Cystopteris and Polypodium, with comments on their reticulate relationships
Journal: Amer. Fern J
Volume: 81
Pages: 7–23