KEYS TO THE FERNS OF BORNEO 
409 
a. Fronds under 30 cm long. 
d. Pubescence on nether surface 
scattered. 
e. Palese ovate-lanceolate 
01. Paleae linear-lanceolate 
1. C. adnascens. 
2. C. varius. 
di. Pubescence covering surface, but 
appressed. 
e. Free veiniets all running toward 
margin 
5. C. Heteractis. 
7. C. Christii . 
6 . C. borneensis. 
e*. Free veiniets irregular 
dz. Nether surface densely felted 
1. C. adnascens (Sw.) Desv. 
Common. 
Palaeotropic. 
2. C. varius (Kaulf.) Gaud. 
Sarawak, Dutch Borneo. 
Malaya, Polynesia. 
3. C. acrostichoides (Forst.) Presl. 
Common. 
Malaya to Ceylon, Polynesia and Australia. 
4. C. NUMMULARIFOLIUS (Sw.) C. Chr. 
Sarawak, Dutch Borneo; probably common. 
Malaya to India. 
5. C. Heteractis (Mett.) C. Chr. 
Sarawak. 
Northern India. 
6. C. borneensis Copel. n. sp. 
Kinabalu. 
Endemic. 
7. C. Christii (Gies.) C. Chr. 
Dutch Borneo. 
Endemic. 
This and C. Heteractis are parts of the old “collective 
species,” C. Lingua. I have sterile specimens of three 
other Bornean species of this group. 
