Ferns of British India and Ceylon. 
137 
lower ones arcuately anastomosing, forming elongated costal areoles 
(one or more series), the margiml venules free ; fronds pinnate or 
pinnatifid ; segments or pinnae sharply serrated, rhizome sub-globose. 
I. DooDiA DIVES. {Kimze.) Rhizome obliquely ascending, 
paleaceous, rootlets clothed with black fibre ; stipes angled brown, 
very paleaceous near the base ; fronds coriaceous, glabrous ovate- 
oblong, long caudate at the apex, pinnate at the base, with some of 
the lower pinnae auricled, pinnatifid above ; pinnae and segments 
patently divergent, oblong, margins pungently serrated ; pinnas or 
segments of the fertile fronds often distant ; sori in one or two series 
on each side of the costa of the pinnae and segment-, and also on 
the wings of the rachis, lunate, often more or less confluent. Kze. in 
Schk. Fil. SuppL ii. / 12. t. 185. Hook. Sp. Fil. iii. 73. Syn. 
Fil. 189. Bedd. F S. L t. 222. 
Ceylon, Hackgalla a'^d the central provinces above 4,000 feet 
elevation, 
(Also in Java.) 
TRIBE VIII.— ASPLENIEi^:. 
Sori attached to the veins, oblique with regard to the costa or ^ 
occasionally sub-parallel with it, linear or oblong or horseshoe- 
shaped ; indusium the same shape as the sorus, when single opening 
towards the midrib, sometimes double. 
GENUS XXXIX.— THAMNOPTERIS. {Presl) 
{Thamjios^ a thicket ; pteris^ fern.) 
Sori unihteral Hnear; indusium linear, straight, single, free 
exteriorly ; veins forked ; venules parallel ; their apices combined by 
a transverse continuous marginal vein ; fronds undivided, simple, 
narrow-lanceolate to broad-lanceolate. 
I. Thamnopteris Nidus. {Linn.) Fronds very variable in 
length and breadth, lanceolate acute or acuminate at the apex, taper- 
