Ferns of British India and Ceylon. 
199 
TRIBE IX.— ASPIDIEiE. 
Sori dorsal, subglobose, rarely elliptical ; indusium superior, 
similar in shape to the sorus, fixed either by the centre or a sinus. 
GENUS XLVII.- -DIDYMOCHL^NA. {Desv) 
{Didymos^ double; chlcBfia^d. cloak ; — the double indusium.) 
Sori elliptical, terminal on a veinlet, but distinctly intramarginal; 
indusium elliptical, marginate at the base, attached longitudinally to the 
linear receptacle, free all round the edge; veins subflabellate, free, their 
apices clavate ; fronds bipinnate, pinnules articulate with the rachis. 
I. DiDYMocHL/ENA LUNULATA. {Desv.) Caudcx ercct, sub- 
arborescent ; fronds densely tufted, 4-6 feet long, bipinnate ; pinnules 
|-i inch broad, dimidiate, subquadrangular, entire or slightly sinuated; 
texture subcoriaceous ; veinlets forked or pinnate, their apices 
marked with white dots; sori 2-6 to a pinnule. Z)esv. in Mevi, 
Soc. Linn. vi. /. 282. Hook. Sy?t. Fil.p. 248. Bedd. F. B.I. t, 15. 
Birma and the Malay Peninsula. 
(Also in Tropical America ; East African Islands ; Malay 
Islands ; Fiji.) 
GENUS XLVIIL— MESOCHL^NA. Br) 
(Mesas J middle ; chlcena^ cloak, attachment of the indusium.) 
Sori and indusium of Didymochlsena, but habit and venation of 
Nephrodium, the lower pair of veinlets anastomose, the others 
free, parallel ; fronds bipinnatifid. 
I. Mesochl.^:na POLYCARPA. {Bl. tiuder Aspidium) Caudex 
erect; stipes tufted, short; fronds 2-3 feet long, 12-18 inches 
broad, pinnate ; pinnae close, very numerous, spreading, dwindling 
down below to mere auricles, the largest 6-9 inches long, \ inch 
broad, cut down half-way or more to the rachis into linear -oblong 
lobes ; rachis and lower surface villose ; veins very close, pinnated, 
