PLEOPELTIDIS SPECIERÜM MALAIARUM ENUMERATIO. 
AN 
ENUMERATIVE REVISION OF THE MALAYAN SPECIES OF 
THE FERNGENUS PLEOPELTIS. 
BY Capt. C. R. W. K. van ALDERWERELT van ROSENBURGH. 
The following list of the Malayan species of the fern genus 
Pleopeltis is intended as a correction of my Handbook on Ma- 
layan Ferns. 
When arranging this work I really considered Pleopeltis and 
Selliguea to be different from the genus Polypodium but I did 
not separate them from it, because the necessity would then 
have arisen to rename a too large number of species. When 
Christ’s criticism on Christensen’s Index Filicum, in which the 
former scholar advocated the aforesaid separation, came into my 
hands, my manuscript was already in the press, and revision 
was then impossible. 
In distinction from Christ, ho wever, who considers Pleopeltis 
and Selliguea as two different genera, 1 take the latter as a section 
of the former, in view of the great affinity between them and 
the existense of intermediate forms (species with linear-oblong, 
round and confluent, linear and interrupted sori); 
For the saké of convenience the species are given in this 
list with the same numbers as in my Handbook, where they 
are enumerated under the heading „Polypodium”, 
Tokyo, March 1909. 
PLEOPELTIS, MMinnh, \ 
Sori round, oblong, linear oblong or linear, superficial or 
immersed, generally compital, the oblong ones mostly, the linear 
