354 
KEYS TO THE FERNS OF BORNEO 
c?i. Thinner in texture. 
/. Frond about i m. long 
fi. Frond under 40 cm. long. 
g. Scales on rachis few if any 
g 1. Rachis very scaly 
di. Pinnae cut not over 1/3 to costa 
29. D. trichopoda. 
26. Z). athyriocarpa. 
30. D. paucisora. 
31. D. hirtipes. 
Subgenus II. Veinlets 
definite and distinct. 
uniting in pairs; sori 
Nephrodium. 
a. Only the lowest veinlets anastomosing. 
b. Rhizome wide-creeping, fronds scattered. 
c. Somewhat coriaceous. 
d. Frond glabrous 
di. Minutely pubescent beneath 
ci. Not at all coriaceous 
bi. Rhizome short, fronds clustered. 
c. Pinnae serrate, auricled. 
d. Fronds dimorphous 
di. Fronds alike 
c*. Pinnae lobed less than 1/3 to costa 
£2. Pinnae lobed more than 1/3 to costa. 
d. Lower pinnae hardly reduced. 
e. Subcoriaceous, lobes wide 
£i. Herbaceous, lobes narrow. 
f. Finely hairy everywhere 
fi. Coarsely hairy, the indusia 
especially so 
di. Lower pinnae reduced. 
e. Indusium wanting 
ei. Indusium present. 
/. Rachis naked beneath 
fi. Rachis minutely hairy 
/2. Rachis villous or setose 
beneath. 
g. Veinlets 3-5 pairs 
gi. Veinlets 6-9 pairs 
a*. Two or more pairs of veinlets anastomosing. 
b. Rhizome creeping, fronds scattered. 
c. Lower pinnae not conspicuously re¬ 
duced. 
d Sori mostly subterminal on veinlets. 
43 - 
46. 
32 . 
33 - 
59 - 
34 - 
35 - 
36 . 
37 - 
56 . 
38 . 
39 - 
40. 
41. 
D. gongylodes. 
D. hacnkeana. 
D. procurrens. 
D. Hewittii. 
D. comp acta. 
D. Broohsii. 
D. motley ana. 
D. parasitica. 
D. didymosova. 
D. pennigera. 
D. angustipes. 
D. heterocarp a. 
D. hispidifolia 
D. stipellata. 
e. 
Sori submarginal in lobes 
42. D. pteroides. 
ei 
. Sori not confined to lobes. 
/. Texture coriaceous 
43. D. gongy lodes. 
fi. Texture papyraceous 
44. D. Toppingii. 
, 
Sori medial on veinlets. 
e. 
Indusium evident 
61. D. oosora. 
ei 
. Indusium wanting 
45. D. prolifer a. 
