406 keys to the ferns of Borneo 
101. P. fluviatile Lautbach. 
Dutch Borneo. 
Local. 
102. P. regulare Mett. 
Dutch Borneo. 
Endemic. 
103. P. interruptum C. Chr. 
Gymnogramme acuminata Baker. 
Sarawak. 
Endemic. 
104. P. macrophyllum (Bl.) Reinw. 
Sarawak, Dutch Borneo, North Borneo. 
Malaya to China and New Guinea. 
105. P. Hosei C. Chr. 
Gymnogramme campyloneuroides Baker. 
Sarawak, Dutch Borneo. 
Malacca. 
106. P. loxogrammoides Copel. 
Sarawak (Limbang). 
Local. 
107. P. Eeei (Bory) Mett. 
Sarawak, Dutch Borneo. 
Malaya, Polynesia. 
108. P. METTENIANUM Cesati. 
P. heterocarpum Mettnon Bl. 
Common. 
Malaya. 
Subgenus V. MYRMECOPHILA. 
a. Frond sinuate or shallowly lobed 109. P. sinuosum. 
a*. Frond pinnatifid, 
b. Rhizome forming a single crust no. P. lomarioides. 
b 1. Rhizome forming a series of crusts in. P. muabilc. 
109. P. sinuosum Wall. 
Sarawak, Dutch Borneo, North Borneo. 
Malaya, Melanesia. 
