KEYS TO THE FERNS OF BORNEO 
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21. HUMATA Cavanilles. 
a. Fronds not deltoid. 
b. Fronds merely toothed 
Fertile fronds pinnately lobed 
bz. Fronds pinnate. 
c. Pinnae (unless the lowest pair) entire 
c 1 . Pinnae toothed or pinnatifid 
ai. Lowest pinnae the largest. 
b. Ultimate segments not setiform. 
c. Fronds pinnatifid, only the lowest 
segments lobed 
a. Fronds barely pinnate, lower segments 
pinnatifid 
r 2 . Fronds pinnate, pinnae distinct. 
d Fronds not very unlike. 
c. Minutely ciliate 
0L Glabrous 
rth. Distinctly dimorphous. 
e. Sterile segments sharply toothed 
Sterile segments entire or nearly so. 
/. Sori flanked by prominent teeth 
/i. Fertile lobes truncate 
b L Ultimate segments setiform 
1. H. angustata. 
2. H. heterophylla. 
3. H. gaimardiana. 
4. H. Brooksii. 
5. H. intermedia. 
6. H. pectinata. 
7. H. puberula. 
8. H. repens. 
9. H. alpina. 
10. H. pusilloides. 
11. H. kinabaluensis. 
12. H. parvula. 
I. H. angustata (Wall.) J. Sm. 
Sarawak, Dutch Borneo. 
Malaya. 
2 . H. HETEROPHYLLA (Sm.) DeSV. 
Common. 
Malaya, Polynesia. 
3. H. GAIMARDIANA. 
Sarawak, Dutch Borneo; probably everywhere. 
Malaya to Burma and Polynesia. 
4. H. brooksii Copel. 
Sarawak (Mt. Poe). 
Endemic. 
5. H. INTERMEDIA C. Chr. 
Sarawak. 
Perak. 
