Verbatim text: Hickey, R. J., W. C. Taylor, and N. T. Luebke. 1989. The species concept in Pteridophyta with special reference to Isoëtes. Amer. Fern J. 79: 78--89.
Author: Hickey, R.J., Taylor, W.C., Luebke, N.T.
Year: 1989
Title: The species concept in Pteridophyta with special reference to Isoëtes
Journal: Amer. Fern J
Volume: 79
Pages: 78–89