336 Ferns of British India and Ceylon. 
disk of the frond, a single pair runs through each terminal segment 
connivent at the apices ; venation manifest prominent beneath, all 
the costae are united by transverse flexuose costules, these by a lon- 
gitudinal flexuose vein through the middle into two nearly equal 
series of costular areoles, then again into lesser ones all subquadran- 
gular; sori small, superficial copious, scattered in the areoles, but 
generally in series more or less perfect and accompanied by a resinous 
or gummy substance. R.Br An Hook, and Grev. Ic. Fil. t. 168-9. 
Hook. Sp. FlL v. 99. Wall Cat. n. 287. Bedd. F. B. I. t. 80. 
main veins, confluent, not gummy. R. Br. Hook. Sp. Fil. y. p. 99. 
Bedd. F. B. I. t. 321. Polyp, conjugatum, Kaulf. {not Lam.) 
Polyp. Dipteris {Bl.), Hook. Syn. Fil. 362. 
Malacca, Penang and Singapore. 
(Also in the Malay and Pacific Islands.) 
3. Dipteris Lobbiana. {Hook.) Stipes i foot and more long j 
fronds coriaceous, 8-12 inches long, flabelUfoim, glabrous, 3-4 times 
Khasya, up to 4,000 feet, 
Borpani, 2,000 feet, and elsewhere, 
Cachar, at Luckipoor, 250 feet 
elevation, Jaintea, Sylhet station 
in the plains. 
DIPTERIS HORSFIELDII. {Bj\) 
2. Dipteris Horsfieldii. 
{Br.) Stipe strong, 3-5 feet long ; 
frond 1-3 feet long, and much 
broader, the main lobes reaching 
three-quarters of the way down, 
the edges sharply toothed, texture 
subcoriaceous, upper surface dark- 
green, lower very glaucous, main 
veins very prominent, dichoto- 
mously forked ; areoles copious ; 
sori very minute, scattered irreg- 
ularly, especially plentiful near the 
