KEYS TO THE FERNS OF BORNEO 
355 
c i. Lower pinnae conspicuously reduced. 
d. Sori subterminal, lower pinnae 
abruptly shortened. 
e. Frond over 60 cm. long 
£i. Frond under 60 cm. long 
rfi. Sori medial; lower pinnae grad¬ 
ually reduced 
fei. Rhizome short, fronds clustered. 
c. Lower pinnae conspicuously reduced. 
d. Indusium evident. 
e. Nether surface not evidently 
hairy. 
/. Larger pinnae over 25 mm. 
wide. 
g Minutely glandular beneath 
gi. Minutely verruculose 
/i. Larger pinnae under 20 mm. 
wide. 
g. Rigidly coriaceous 
gi. Not at all coriaceous 
£i. Nether surface somewhat hairy. 
/. Frond under 20 cm. wide 
fi. Frond over 20 cm. wide 
£2. Nether surface very hairy 
d 1 . Indusium wanting 
46. D. haenkeana. 
47. D. unit a. 
48. D. aridu. 
49. D. porphyricola. 
50. D. truncata. 
51. D. lithophylla. 
52. D. megilphylla. 
53. D. avbuscula. 
54. D. amboinensis 
55. D. sagittifolia. 
56. D. pennigera. 
bz. Rhizome short. 
c. Lower pinnae not conspicuously 
reduced. 
d. Rachis clothed with narrow, spread¬ 
ing scales 
di. Rachis naked beneath. 
e. Pinnae lanceolate or linear. 
/. Pinnae about 30 cm. long, 
toothed 
/i. Pinnae about 15 cm. long, entire, 
red 
/2. Pinnae about 6 cm. long 
£i. Pinnae oblong or ovate. 
/. Pinnae narrowed to base 
f 1 . Pinnae truncate at base 
d^. Rachis hairy. 
e. Pinnae less than 3 cm. wide, more 
or less cut. 
/. Surfaces pubescent 
/i. Surfaces naked 
£i. Pinnae 3 cm. wide, subentire, a 
single pair 
57. D. ferox. 
58. D. penangiana. 
69. D. rubida. 
59. D. comp acta. 
62. D. acanthocatpa. 
63. D. labuanensis. 
60. D. simillima. 
61. D. oosora. 
64. D. mivabilis. 
ft 
