384 KEYS TO THE FERNS OF BORNEO 
18. A. TENERUM Forst. 
Common. 
Eastern Tropics. 
19. A. MACROPHYLLUM Sw. 
Sarawak, Dutch Borneo (probably everywhere). 
India to the Comores and Polynesia. 
20. A. paradoxum Bl. 
Dutch Borneo. 
Malacca, Sumatra, Java. 
Not very distinct from the preceding species. 
21. A. falcatum Lam. 
A. adiantoides (L.) C. Chr. non Lam. 
Common. 
Palaeotropic. 
22. A. ACUTIUSCULUM Bl. 
Dutch Borneo, British North Borneo. 
Malaya, Philippines, New Guinea, Samoa. 
23. A. CAUDATUM P'orst. 
British North Borneo. 
Pantropic. 
24. A. persicifolium J. Sm.; Hook. 
British North Borneo, Dutch Borneo. 
Philippines, Celebes. 
25. A. vulcanicum Bl. 
Sarawak, British North Borneo. 
India, Malaya, Formosa. 
Related to A . squamulatmn and A . filiceps. 
26. A. laserpitifolium Lam. 
Probably everywhere. 
Malaya, Polynesia. 
27. A. cuneatum Lam. 
Dutch Borneo, Kinabalu at 3,600 m. 
Pantropic. 
