KEYS TO THE FERNS OF BORNEO 
333 
■e. Segments contiguous or imbricate, 
8-10 mm. wide 
/. Pinnae with winged stalks 
/i. Pinnae winged sessile or stalks 
not winged. 
g. Pinnae cut within 0.2 mm. of 
the costa 
g 1. Segments connected by a 
broader wing. 
Ji. Lower pinnae forked 
h 1. Lowest pinnae not forked 
re Stipes maroon or nearly black. 
d. Lateral pinnae 1 or 2 pairs 
d*. Pinnae more numerous. 
e. Fronds about 1 m high 
£L Fronds much smaller. 
/. Only the basal pinnae forked 
/i. Several pairs of pinnae forked 
a r . Veins anastomosing. 
b. Lowest pinnae not much longer than the 
succeeding, 
c. Axes stramineous 
ri. Axes maroon 
6*. Lowest pinnae much enlarged. 
c. Areolae a single row 
c J . Veins anastomosing more freely 
12. P. Toppingii. 
8. P. longipinnula. 
9. P. asperula. 
10 P. quadriaurita. 
11. P. ClemensicB. 
7. P. ligulata. 
13. P. decussata. 
14. P.fuvcans. 
15. P. Walkeri. 
17. P. biaurita. 
16. P. purpureorachis 
18. P. wallichiana. 
19. P. tripartita. 
1. P. LONGIFOLIA L. 
Common, though not reported from Dutch Borneo. 
All warm countries. 
2. P. PEllucida Pr. 
Sarawak. 
Philippines, India (?). Credited also to Java, but 
this is questionable. 
3. P. RANGIFERINA Pr. 
Sarawak (Mt. Penrissen), Kinabalu. 
Java. 
P. Dalhousice Hooker, is reported from Kinabalu by 
Miss Gibbs, but I suspect that she had the fern which I 
distinguish as P. rangiferina . 
4. P. ensiformis Burm. 
Common. 
Malaya to India, China, Polynesia and Australia. 
