KEYS TO THE FERNS OF BORNEO 
299 
PAM. I. OPHIOGLOSSACEAS. 
a. Veins reticulate 1. Ophioglossum. 
Veins free. 
b. Fertile division of frond loosely com¬ 
pound 2. Botrychium. 
bi . Fertile division compact 3. Helminthostachys. 
1 . OPHIOGLOSSUM Linnaeus. 
a. Fertile and sterile segments separating at 
or below the base of the sterile. 
b. Sterile segment cordate 
in. Sterile segment not cordate 
<JL Fertile segment rising from sterile. 
b. Terrestrial 
&L Epiphytic. 
c. Stipe as long as blade 
c 1. Stipe relatively short 
1. 0 . reticulatum. 
2. 0 . pedunculosum. 
3. O. intermedium. 
4. 0 . Moultoni. 
5. 0 . pendulum . 
1. O. RETICULATUM L. 
Sarawak, Kinabalu. 
Pantropical. 
2. O. pedunculosum Desv. 
O. cumingianmn Presl. 
Sarawak, North Borneo (Kinabalu and Sandakan). 
Malaya to India, Japan and New Zealand. 
3. O. intermedium Baker. 
Sarawak, Kinabalu. 
Java, Mindoro, New Guinea. 
4. O. Moultoni Copel. 
Sarawak (Bukit Buyo). 
Local. 
5. O. pendulum L. 
Sarawak. 
Mauritius to Hawaii. 
