94 
VI. POLTSTICHOf. 
deeply serrated on the margins, with spinulose-serratures ; 
they are truncate at the 
base, auricled on the up^- 
per side, and somewhat 
rounded on the lower, the 
two sides forming an ob- 
tuse angle, which is at- 
tached to the rachis by a 
distinct slender stalk. The 
basal anterior pinnules are 
usually scarcely larger 
than the others, but are 
iu most cases more deeply 
serrated, and sometimes 
along with others near the 
lower end of the pinnae are 
deeply pinnatifid, or even 
partially pinnated (when 
it forms the variety sub- 
tripinnatum). Various de- 
grees of this 
subtri pinnate 
condition are, 
however, met 
with. The base 
of the pinnules 
in P. angulare, 
instead of for- 
ming an acute 
angle, as de- 
scribed under 
P. aculeatum, 
forms a very 
obtuse angle, 
the point of 
the angle being 
not attached 
directly to the 
rachis as in 
[Polystichum subtripinnatumj 
