134 VII. LASTKEA. 
the rest, which gradually become smaller towards the 
apex ; all the lower ones being distinctly stalked. The 
pinna? are -bipinnate, the basal pinnules 
I being stalked, those towards the apex l>e- 
coining decurrent. The first inferior pin- 
nules nn two or three of the lowest pinnae 
is considerably enlarged, those of the lowest 
pinnae most so, the other pinnules becom- 
ing shorter towards the apex ; so that all 
the lower pinnae have a triangular outline, 
the lowest being broadest. The lowest 
basal pinnules are divided first into ovate- 
oblong secondary pinnules, of which the 
lower are stalked and the upper decurront, 
and the largest of these are again divided 
almost down to their midrib into oblong 
serrated lobes. The pinnules towards the 
apex of the pinnae are cut into oblong 
serrated lobes, and those quite at the apex 
are decurrent, and deeply toothed. All 
[Lastreafoeuisecii] thelobeg ^ sharp i y serrated, the teeth 
everywhere ending in a short spinous mucronate point. 
The venation selecting for examination a central 
pinnule from one ot the central pinnae is thus arranged : 
There is a medial dark-coloured midvein ; from this the 
veins proceed alternately one to each lobe, and branch 
off into about two or three venules, one of which extends 
towards each tooth, but terminates before reaching it, the 
basal anterior venule bearing a sorus some distance from 
its extremity, and just beneath the sinus of the lobe. 
These pinnules therefore bear two lines of sori, one on each 
side their midvein, and at some distance from it. On all 
the larger pinnules the sori are biserial on the secondary 
pinnules and lobes, so that the sori are abundantly and 
nearly equally distributed over the whole under surface of 
the frond. They are covered by small reniform indusia, 
