89 
shaped, acute and aristate at the apex, and fringed -with 
spiny-serratures on the margin. On each pinna the an- 
terior basal pinnule is larger and longer than the rest, the 
side next the main 
rachis being usually 
straight, and forming 
a line parallel with it, 
and the apex pointing 
directly towards the 
apex of the frond ; a 
row of these enlarged 
pinnules is thus found 
on each side the main 
rachis. All the pin- 
nules are more or less 
convex, and, especially 
the enlarged one, dis- 
tinctly auricled at their 
base on the exterior 
side, the auricles being 
sharply awned. The 
midvein -of the pin- 
nules branches alter- 
nately into free alter- 
nate veins, which are 
generally three or four 
branched, the lower 
anterior branch or ve- 
nule bearing a medial 
sorus ; the vein proceed- 
ing up the auricle is 
pinnately branched with 
simple venules,several of 
which produce a sorns. 
The sori thus form two 
lines parallel with the 
midvein of the pinnules 
[Polystichum tobatum.] &n * ^ of their aurf - 
