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INTRODUCTION TO 
It is now nearly twenty years since Bishop Hose, 
near the close of his own period of active collection, listed 
the ferns then known in Borneo, 430 in number. In the 
intervening years, Christ has described a considerable 
number of novelties sent to him by Dutch collectors; a 
number of species from the same sources have been 
described by Van Alderwerelt and Rosenstock; a consid¬ 
erable number of Sarawak ferns have come to me for 
identification and description ; and there have been a few 
additions to the Kinabalu flora. It is believed that all 
the ferns in Bishop Hose’s list, a few others from earlier 
collections, and all more recent publications regarding 
Bornean ferns have been considered in making the follow¬ 
ing list. The number of species which seem to me to be 
distinctly known is now approximately 700; including 
species of decidedly doubtful occurrence, which I have 
thought it better to mention without including them in 
the keys, the number is somewhat greater. 
The list is prepared at the request of the late curator of 
the Sarawak Museum, Mr. J. C. Moulton, with the joint 
feeling that it should facilitate the local identifica¬ 
tion of the ferns of Borneo, and in this way materially 
encourage their collection and study. The following 
treatment falls into several parts: 
(a) A systematic enumeration of the families and 
genera of Bornean ferns, in the best approximation which 
I can at this moment make to their natural arrangements. 
( b ) Keys to the families; under the families, to the 
genera; and under the genera, to the species of known 
Bornean ferns. 
(c) An enumeration under each genus of the known 
species, including, in the case of single collections, th§ 
definite location, if this has been published; also a state- 
