Handbook of the fern-allies : a synopsis of the genera and species of the natural
orders : Equisetaceae, Lycopodiaceae, Selaginellacea, Rhizocarpeae / by J. G. Baker,
1887
Synopsis filicum or, A synopsis of all known ferns... / by the late Sir William Jackson
Hooker, ... and John Gilbert Baker, ... 2nd ed. 1883