KEYS TO THE FERNS OF BORNEO 
389 
1. D. lobbiana (Hooker) Moore. 
Sarawak, Dutch Borneo, North Borneo. 
Celebes, Malay Peninsula. 
2. D. Nieuwenhuisii Christ. 
Dutch Borneo, Sarawak. 
Endemic. 
3. D. quinquefurcata (Baker) Christ. 
Sarawak. 
Endemic. 
4. D. conjugata Reinw. 
Common. 
Malaya to Polynesia. 
54. CHEIROPLEURIA Presl. 
C. bicuspis (Bl.) Presl. 
Common. 
Malaya to Liu Kiu and New Guinea. 
The forking of the sterile frond is very variable. 
55. PLATYCERIUM Desvaux. 
a. Without distinct fertile segments 1. P. grande, 
xi 1. With distinct fertile segments. 
b. Fertile segment longer than wide 2. P. Ridleyi. 
b*. Fertile segment wider than long 3. P. coronarium. 
1. P. grande (A. Cunn.) J. Sm. 
North Borneo. 
Malaya, Australia. 
2. P. Ridleyi Christ. 
“ Borneo.” 
Lingga, Singapore. 
3. P. coronarium (Koenig) Desv. 
Common. 
Malaya, Siam. 
