KEYS TO THE FERNS OF BORNEO 
381 
rfi. Small ferns, usually 2-3 cm. wide. 
e. Stipe long and very slender 
a. Stipe stout. 
6. A.filiceps. 
f. Edge of indusium marked by a 
raised line on the frond 7. 
/i. Without line at edge of indusium 8. 
bi. Fronds pinnate. 
c. Stipes dark and polished. 
d. Sori solitary in lobes 
<A. Sori on body of pinnae. 
c. Apex proliferous, pinnae obtuse 
e 1 . Apex acuminate, pinnae acute 
ri. Stipes not polished. 
d. Pinnae very large, elliptic 
d 1 . Pinnae narrowly linear 
d%. Pinnae intermediate between the pre¬ 
ceding. 
e. Pinnae obtuse. 
/. Shpe short, pinnae reduced below. 
g. Rachis nearly naked, pinnae 
toothed 14. 
Rachis scaly, pinnae subentire 15. 
A. scolopendvoides. 
A. concolov. 
11. A. chcilosorum. 
12. 
FT 
9 - 
10. 
A. normale. 
A. uu Hater ale. 
A. trifoliatum. 
A . subaquatile. 
a I. 
A. borneense. 
A . pellucidum „ 
/i. Stipe long, lower pinnae not 
reduced 
ei. Pinnae acute or acuminate. 
1 . Frond linear or lanceolate. 
g. Rachis nearly naked 17. 
g 1. Rachis fibrillose-scaly 18. 
/i. Frond brcader. 
g. Pinnae deltoid-lanceolate. 
Ji. Veins evident beneath 19. 
h 1. Veins inconspicuous beneath 20. 
gi. Pinnae narrowly lanceolate, 
sharply toothed. 
li. Sori spreading. 
i. Venation close 21. 
A. Venation lax, rachis pro¬ 
liferous 22. 
//i. Sori subparallel to costa 23. 
gz. Pinnae lanceolate, not sharply 
toothed. 
16. A . fultginosum. 
li. Foliage dark-green 
la. Foliage pale-green 
bz. Frond barely bipinnate 
bs. Frond bipinnate to quadripinnate. 
24. 
25 - 
22. 
A. longissivmm 
A. tencrum . 
A. macrophyllum. 
A. paradoxum. 
A. falcatum. 
A. acutiusculum. 
A. caiiaatuvi. 
A . f>.crsicifolium. 
A. vulcanicwn. 
A. acutiusculum. 
