Verbatim text: Soper, J. H. and S. Rao. 1958. Isoëtes in eastern Canada. Amer. Fern J. 48: 97--102.
Author: Soper, J.H., Rao, S.
Year: 1958
Title: Isoëtes in eastern Canada
Journal: Amer. Fern J
Volume: 48
Pages: 97–102