KEYS TO THE FERNS OF BORNEO 
347 
d. Indusium wanting. 
e. Costae moderately scaly beneath 
ei. Costae densely scaly beneath 
di. Indusium present. 
c. Segments (or secondary pinnules) 
linear. 
/. Rachis smooth 
fi. Rachis prickly 
ei. Segments (or secondary pinnules) 
oblong. 
/. Pinnae up to 30 cm. long 
/i. Pinnae larger. 
g. Scales on costa entire 
gi. Few costal scales ciliate 
ci. Segments entire or finely toothed 
near apex. 
d. Veins simple, indusium wanting. 
e. Rachises densely pubescent 
ei. Rachises not densely pubescent 
di. Lower veins forked. 
e. Costae and rachises very densely 
scaly; coriaceous 
ei. Costae covered with pale-brown 
scales, rachis naked 
ez. Costae and rachises moderately 
scaly 
e. 3 . Costae sparsely scaly, rachises 
fibrillose or naked beneath. 
/. Segments over 3 mm. wide. 
g. Stipe stout, blackish spiny 
g 1. Stipe slender, chestnut, 
merely rough 
fi. Segments about 2 mm. wide 
# 4 . Costae and secondary rachises 
hairy. 
/. Indusium wanting 
fi. Indusium present 
e 5 . Costae naked beneath, or very 
nearly so 
29. C. inciso-sert at a. 
37. C. crinita. 
33. C. cyclodonta. 
34. C. Teysmannii. 
30. C assimilis. 
31. C. longipes. 
32. C. ampla. 
35. C. Waliacei. 
18. C. squamulata. 
36. C. megalosora. 
38. C. longipinna. 
39. C. hemiclilamydea. 
40. C. borneensis. 
41. C. leucocarpa. 
44. C. latebrosa. 
42. C. Burbidgei. 
43. C. leucotricha. 
45. C. coniaminans. 
1. C. Brunonis Wall. 
Sarawak (common), Dutch Borneo. 
Malaya. 
How far previous collections may really represent 
this species I do not know. I have no Bornean specimen 
which is like the Malacca plant. 
