KEYS TO THE FERNS OF BORNEO 
303 
7. G. linearis (Burm.) Clarke. 
Common. 
Pantropical and subtropical. 
A very variable fern, of which there are many 
“ varieties.” 
8. G. bullata Moore. 
Kinabalu. 
Java. 
9. G. Norrisii Mett. 
Kinabalu. 
Malacca-. 
10. G. japonica Spr. 
G. glauca Hooker. 
G. longissima Bl. 
Common. 
The Orient. 
PAM. VI. HYMBNOPHYLLACBiE. 
a. Involucre (indusiura) distinctively two¬ 
lipped* 1. Hymenophyllum. 
a 1 . Involucre distinctively tubular or funnel- 
shaped, sometimes two-lipped at the apex 2. Trichomanes. 
1 . HYMENOPHYLLUM Smith. 
a. Margin entire EUHYMENOPHYLLUM. 
tfi. Margin serrate or spinulose LEPTOCIONUM. 
Subgenus I. EUHYMENOPHYLLUM . 
a. Fronds glabrous. 
b. Main rachis not winged throughout 1. H. eximium. 
fa. Main rachis winged throughout. 
c. Valves of the indusium entire or 
nearly so. 
d. Well developed fronds over 15 cm. 
tall. 
e. Receptacle globose, valves not 
broader than long 2. H.formosum. 
e 1 . Receptacle mallet-shaped, valves 
broader than long 3. H. Jungliuhnii. 
* Hymenophyllum Foxwovthyi is an exception and can be recognized 
by the involucre as described for Trichomanes. The frond is about 7 cm. 
tall, fuscous, lanceolate and thereby distinct from any species of Tricho¬ 
manes. 
