356 
KEYS TO THE FERNS OF BORNEO 
Subgenus III. I. Veins anastomosing in pairs ; 
and the sovi disposed to unite in pairs where the 
veinlets meet', sori often indefinitely elongate 
along the veins Meniscium. 
a. Sori round and definite. 
I/. Frond simple 
£>i. Frond pinnate. 
c. Veinlets only 3 or 4 pairs 
a. Veinlets numerous. 
d. Pinnae truncate at base 
rfi. Pinnae rounded or cuneate at base 
Some sori elongate and rather indefinite. 
b. Lower pinnae not truncate or auricled at 
base. ' 
c. Lateral pinnae normally one pair 
a. Lateral pinnae more numerous. 
d. Pinnae over 2 cm. wide 
d*. Pinnae narrower. 
c. Tips of pinnae rounded 
£!. Pinnae finely acuminate 
Zu. All pinnae truncate, auricled or both. 
c. Pinnae 2 cm. or more wide. 
d. Most sori round, indusiate 
d 1 . Most sori elongate, exindusiate. 
c. Lateral pinnae about one pair 
Lateral pinnae more numerous 
c J . Pinnae 1 cm. or less wide. 
d. Pinnae 20 or more pairs 
di. Pinnae less numerous 
65 D. holophylla. 
66. D.firmula. 
67. D. lineata. 
68. D. urophylla. ■ 
71. D. tviphylla. 
70. D. cuspidata. 
72. D. aqnatiloides. 
73. D. salicifolia. 
67. D. lineata. 
74. D. cordifolia. 
77. D. stegnogy amine. 
75. D. brevipinna. 
76. D. Hosei. 
Subgenus IV. Veins ayiastomosing; sori elongate, 
naked but not fusing in pairs Stegnogramma. 
a. Fronds large and very hairy 77. D. stegnogramme. 
Subgenus V. Veins free; sori elongate along 
veins, naked Leptogramma. 
a. Fronds bipinnatifid, hairy 78. D. africana. 
* 
i. D. sarawakensis (Baker) v. A. v. R. 
Probably common, but not reported from North 
Borneo. 
Malaya to India and Japan. 
This is construed as including Aspidium intermedium 
Bl., but not D. rhodolepis (Clarke) C. Chr. I do not 
understand why Christensen did not adopt “ Blumei” as 
the specific name, but it is not available now. 
