Ferns of British India and Ceylon. 
223 
varieties one of the other), are placed far apart ; it is a fact, however, 
that most of the species have both orbicular and reniform involucres, 
sometimes on the same individual, the involucres often varying much 
more than this, being athyrioid and asplenioid. Mr. Clarke has 
placed both Aspidium and Sagenia in Nephrodium, a genus widely 
different in habit. 
GENUS LII.— PLEOCNEMIA. {PresL) 
{Pleos^ full ; knemia^ rays ; in allusion to the venation.) 
Only differs from Aspidium in its less compound venation, only 
the lower veins anastomose arcuately forming one series of areoles 
near the costa (as in Campteria), without any free veinlets within 
them, the other veins generally all free, or some angularly anastomos- 
ing; sori generally at the apex of the free veinlets outside the areoles, 
but sometimes some are on the netted veins, {i.e.^ compital). 
1. Pleocnemia Thwaitesii. {Bedd.) Stipes tufted i-ii- feet 
long, shining blackish-purple as is the rachis and main costa, basal 
scales linear dark- brown ; fronds deltoid, i\-2 feet each way, tripin- 
natifid; lowest pinnae largest deltoid stalked, with several large lanceo- 
late deeply pinnatifid pinnules ; texture rather thick and opaque, the 
veins not conspicuous, glabrous beneath, and also above except the 
costa and veins which are scurfy or puberulous, lower veinlets forming 
elongate costal arches, no /ree included veinlets, the rest free with 
clavate apices, none reaching the margin ; sori rather large in a single 
series on each side of the midrib of the segments, all at the apex of free 
veinlets; indusium reniform, with the lobes of the sinus broad and over- 
lapping, so that it looks orbicular. Sagenia Thwaitesii, Bedd F. S. I. 
t. 244. Nephrodium (Sagenia) simulans (Baker), Hook. Syn. Fil. 300. 
Ceylon, southern provinces near Galle, abundant on the Hay- 
cock Mountain. (C. P. 3331. Thw. E71. p. 390.) 
2. Pleocnemia Trimeni. {Bedd.) Stipes tufted, feet, 
grey, basal scales Unear ; fronds i J-3 feet long, deltoid or deltoid 
lanceolate, pinnatifid at the apex, below pinnate with about 5-6 
pair of lateral pinnae, which are more or less stalked, and all pinnatifid 
