306 
KEYS TO THE FERNS OF BORNEO 
d 1 2 3 . Fronds smaller. 
t. Stipes not winged unless near 
apex. 
/. Frond ovate, greenish 
p. Frond lanceolate brownish. 
g. Indusium deeply cleft 
g 1 . Indusium not deepty cleft 
e 1 . Stipe winged almost to base. 
/. Valves of indusium longer than 
broad, acute 
p. Valves as broad as long, rounded 
a. Valves of indusium toothed. 
d. Margin of lamina crisped 
di. Margin not crisped 
41. Frond hairy, at least on veins or margin. 
b. Central veins bearing wavy outgrowths 
(crests) 
b*. Central veins not crested. 
c. Fronds about 20 cm. long, ovate 
c 1 . Fronds 5—10 cm. long 
c~. Fronds under 5 cm. long. 
d. Lips of indusium ciliate 
d*. Lips of indusium not ciliate 
7. H. production. 
8. H. blumeanmn. 
9. H. Foxworthyi. 
10. H. Hullierii. 
6. H. salakense. 
5. H. australe. 
4. H. devnissum. 
11. H. zollingeriatmm . 
12. H. pachydermimm. 
13. H. obtusum. 
14. H. borneense. 
15. H. Clemensiae. 
1. H. eximium Kze. 
Kinabalu, Sarawak (Mt. Murud). 
Java, Sumatra, Philippines. 
2. H. formosum Brack. 
North Borneo (coll. Burbidge; det. Baker). 
Malaya to New Zealand. 
3. H. J unghuhnii v. d. B. 
Dutch Borneo. 
Malaya to Polynesia. 
H. dilatatum (Forst.) Sw. is reported from Sarawak 
and Kinabalu. From the latter, I have eight sheets of 
H. eximium, which is usually regarded as a synonym of 
H. dilatatum. This is possibly correct. But by the 
three names listed above I recognize three distinct 
Malayan ferns, and must therefore dissent from Kew 
judgment as shown in the Synopsis Filicum where all three 
are listed as synonyms of H. dilatatum. 
