KEYS TO THE FERNS OF BORNEO 
339 
1. O. TRICHOLEPIS Kunze. 
Borneo. 
Not recognized since first collected. 
2. O. OBLANCEOLATA Copel. 
Sarawak, North Borneo. 
Endemic. 
3. O. colubrina (Blanco) Copel. 
Sarawak; probably elsewhere. 
Philippines, Java. 
4. O. NERIIFORMIS Cav. 
Sarawak, Dutch Borneo. 
Tropics. 
This has been construed as including various species, 
which makes its distribution hard to determine from 
reports. 0 . bantarnensis (Bl.) Kze. may be distinct, as 
Cesati thinks, but I cannot identify it, and Blume’s brief 
description is contradictory. 
5. O. coriacea Copel. 
Sarawak (Mt. Batu Lawi). 
Local. 
6. O. musifolia (Bl.) Presl. 
Sarawak, Dutch Borneo. 
Malaya, Ceylon. 
23 . DAVALLIA Smith 
a. Indusium not much longer than broad. 
b. Frond at most tripinnatifid i. D. lobbiana. 
61. Mature frond more dissected. 
c. Indusium truncate 2. D. denticulate. 
Ci. Indusium rounded at apex 3, D . pallida, 
a*. Indusium distinctly longer than broad. 
b. Rhizome scales spreading, grey or slate- 
color when old 4. D. bullata. 
b v Rhizome scales dark when old, not 
appressed 
c. Frond about 15 cm. broad 5. D. Veitchii. 
c*. Frond more than 30 cm. broad, indusium 
rostrate 
62. Rhizome scales dark, appressed 
6. D. embolostegia. 
7. D. solida. 
