380 
KEYS TO THE FERNS OF BORNEO 
31. A. subserratum (Bl.) Milde. 
Sarawak. 
Java, Malacca. 
32. A. fraxin 1 folium (Presl.) Milde. 
Sarawak, Butch Borneo. 
Malaya to India and Japan. 
33. A. pariens Copel. 
Kinabalu (Gurulau Spur). 
Mindanao, Negros, Java. 
Possibly a very ample form of A. cor difolium. 
34. A. cord 1 folium (Bl.) Copel. 
Common. 
Malaya. 
A specimen from the Maraipari spur, Kinabalu, has 
broadly hastate fronds. 
35. A. Cumingii (Presl.) Milde. 
Sarawak (Mt. Poe). 
Philippines, Celebes. 
This specimen is typical, in having the stipe and 
rachis almost naked. 
The “Asplenium elegans ” reported from Borneo 
may have been this species or A . fraxinifolium. 
4. ASPLENIUM Linnaeus. 
a. Sori not solitary on narrow segments. 
b. Fronds simple. 
c. Tips of veins connected by a marginal 
vein (Thamnopteris). 
d. Fronds usually less than 7 cm. wide 1. A. Phyllitidis. 
rtU Fronds usually about 10 cm. wide, 
sori short 
2. A. Nidus. 
3. A . ellipticum . 
d^. Fronds 15-35 cm. wide, sori long 
c*. Tips of veins free. 
d. Large ferns, usually above 5 cm. 
wide. 
e. Coriaceous, entire or nearly so. 
f. Dull-green, not proliferous 
fi. Brown-green, proliferous 
4. A. squamu'latum 
5. A. Broohsii. 
9. A. trifoliatmn. 
e l . Thin, serrate 
