330 
KEYS TO THE FERNS OF BORNEO 
10. CEROPTERIS Link. 
C. calomelanos (L.) Underwood. 
Sarawak, Dutch Borneo and British North Borneo;: 
supposed not to be native. 
Native of tropical America and West Africa; now in 
all warm countries. 
Gymnogramme chrysosorci Baker ( Ceropteris, v. A. 
v. R.), described as a new species from Sarawak, peculiar 
in having a waxy covering on the back of the fertile, but 
not of the sterile, frond, does not seem distinct to me. 
We have specimens from Sandakan with the sterile fronds 
not waxy, and intermediate forms from other parts of 
Borneo. 
Pri nee Bonaparte also reports C. tartarea Link from 
Sarawak; it also is American in origin, but cultivated 
elsewhere. Its frond is bipinnatifid, while adult C. 
calomelanos is tripinnatifid. 
11. CHEILANTHES Swartz. 
C. TENUIFOLIA (Burm.) Sw. 
Common. 
Malaya to India and New Zealand. 
12 . AD 1 ANTUM Linn.-eus. 
a. Fronds simply pinnate. 
b. Densely hairy 
b*. Glabrous 
ai. Well developed fronds at least bipinnate, 
not pedate-deltoid. 
b. Sori roundish or obversely reniform. 
c. Texture very thin. 
d. Pinnules rhomboidal 
(U. Pinnules longer and narrower 
D. Texture firm 
D. Sori straight, wide but not deep. 
c. Pinnules trapeziform in plan 
a. Pinnules cuneate in plan, sometimes 
orbicular 
«2. Fronds pedate-deltoid, tripinnate 
1. A caudatum. 
2. A . philippense. 
3. A. diaphanum . 
4. A . serratifolium 
5. A. pulcherrimutn. 
6. A . Ho set. 
7. A. capillus-veneris. 
8. A. stenochlainys. 
I. A. CAUDATUM. 
Sarawak, Dutch Borneo and British North Borneo. 
Palaeotropic. 
