414 
KEYS TO THE FERNS OF BORNEO 
4. A. COSTATUM V. A. V. R. 
Dutch Borneo. 
Endemic. 
5. A. plantagineum (Cav.) Kaulf. 
Sarawak. 
Malaya to India and Polynesia. 
6. A. latifolium Bl. 
Sarawak. 
Malaya to India and China. 
7. A. reticulatum (Forst.) Kaulf. 
Common. 
Madagascar and India to Polynesia. 
3 . A. CALLIFOLIUM Bl. 
Common. 
Malaya to Polynesia. 
9. A. subfalcatum Brack. 
Sarawak, Dutch Borneo. 
Celebes to Polynesia. 
10. A. coriaceum (Don) Wall. 
Dutch Borneo. 
Malaya, India. 
11. A. vittarioides Baker. 
North Borneo (Amdyah). 
Tonkin. 
The Bornean plant seems to me to be probably 
distinct, but it ought not to be described as new until it 
can be compared with the original. ' 
71 . VITTARIA Smith. 
a. Sorus submarginal, edge of frond or outer 
lip of groove folded over it until maturity. 
b. Frond hairy 1. V. hirta. 
b*. Frond naked. 
c. Frond about 2 mm. wide, over 40 cm. 
long 2. V. longicoma. 
c*. Frond about 3 mm. wide, not over 5 
cm. long 
3. V. pumila. 
