Verbatim text: Pryer, K. M. 1992. The status of Gymnocarpium heterosporum and G. robertianum in Pennsylvania. Amer. Fern J. 82: 34--39.
Author: Pryer, K.M.
Year: 1992
Title: The status of Gymnocarpium heterosporum and G. robertianum in Pennsylvania
Journal: Amer. Fern J
Volume: 82
Pages: 34–39