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 

 pinnat'fid ; segments or pinna? sharply serrated, rhizome sub-globose. 



1. Doodia dives. (Kiinze.) 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 pinna? auricled, pinnatifid above ; pinna? and segments 

 patently divergent, oblong, margins pungently serrated ; pinna? or 

 segments of the fertile fronds often distant ; sori in one or two series 

 on each side of the costa of the pinna? and segment', and also on 

 the wings of the rachis, lunate, often more or less confluent. Kze. in 

 Schk. Fil. Suppl. ii. p. 12. /. 1S5. Hook. Sp. Fil. iii. 73. Syn. 

 Fil. 189. Bedd. F. S. I. t. 222. 



Ceylon, Hackgalla a^d the central provinces above 4,000 feet 

 elevation. 



(Also in Java.) 



TRIBE VIII.— ASPLENIE^E. 



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. (Fresl.) 



(T/iamnos, a. thicket ; pteris, fern.) 



Sori unil iteral linear ; 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. 



1 Thamnopteris Nidus. (Linn.) Fronds very variable in 

 length and breadth, lanceolate acute or acuminate at the apex, taper- 



