Verbatim text: Tryon, R. M. 1955. Selaginella rupestris and its allies. Ann. Missouri Bot. Gard. 42: 1--99, plates 1--6.
Author: Tryon, R.M.
Year: 1955
Title: Selaginella rupestris and its allies
Journal: Ann. Missouri Bot. Gard
Volume: 42
Pages: 1–99
Note: plates 1-6