VI PEEFACE. 



Like Malayan Ferns, the present volume makes no pretence of being 

 either an exhaustive or a flawless work, and I shall feel greatly obhged 

 for any communications tending to point out errors or wrong views not 

 resulting from a difference of conception. 



Finally I wish to express in this place my sincere thanks to Prof. 

 Dr. G. HiEEONYMUS, of Steglitz, for the kindness with which he assisted 

 me in my Selaginella study. 



BuiTENZOEG, July 1914. V. A. V. R. 



