TAB. LI. 
Polypodium (Drynaria) Griffithianum, Hook . 
Fronde simplici chartacea oblongo-seu-ovato-lanceolata in- 
tegerrima vel obsoletissime sinuato-crenata glabra margine 
incrassata, soris maximis prope costam utrinque uniseriatis, 
venularum areolis subtetragonis, venulis ultimis (in areolis) 
liberis simplicibus vel furcatis omnibus ad costam spec- 
tantibus, stipitibus glabris nudis flavo-fuscis frondem 
aequantibus, caudice longe repente ramoso squamoso, 
frondibus subtus praecipue glaucis. 
IIab. On trees, Boutan and Mishmee, Griffith.- ft. glauca . 
Khasya, Griffith , Mrs . Mack , JDrs, Hooker and Thomson. 
In size, general outline and habit, and in colour of var. /?. 
this present Fern is very closely allied to Polypodium glauco- 
phyllum , Kze. in Schk. Fil. 1. Tab. 93, from the West Indies 
and S. America : but the sori are there irregularly scattered 
over the frond, and the venation is totally different : viz. that 
of Goniophlebium . The primary venation is here sufficiently 
conspicuous, but though the frond is tolerably pellucid, when 
held between the eye and the light, the veins are to be traced 
only here and there, with great difficulty, and only in the older 
specimens: they are quite obsolete in the younger plants. 
From all that can be traced the venation is as represented at 
our Fig. 1:— that is, the midrib of the frond is pinnated, 
the pinnae or primary veins run nearly to the edge, but are 
there combined with a continuous intramarginal veinlet. 
These are united by transverse veinlets, forming sub-oblong 
square areolae, and are sometimes again connected by 
cross veinlets. Within the areolae the ultimate, free, simple 
or forked, and always clubbed veinlets, 2-3 in number, 
proceed from the side of the cross veinlet (next the costa) and 
are all directed towards the midrib. The lower cross veinlets 
next the rachis meet in the centre, together with the ultimate 
veinlets of the areolae, and form the receptacle bearing 
the sorus. 
Fig. 1 . Portion of a fertile frond : — magnified. — (N.B. 
The venation is represented more distinct than it can be seen 
in the plant.) 
