POLYSTICHUM ACULEATUM AND ANGULARE. 319 
with the main rachis is very different, this being acute, that of 
P. angulare nearly a right 
angle. The two plants 
rarely grow together in 
the same district, which, 
if not botanical, is at least 
circumstantial evidence of 
their distinctness as spe- 
cles. 
P. aculeatum.—Fronds 
evergreen, generally erect 
through the winter, never 
in its fullest development 
producing the variety sub- 
tripimnatum. Common in 
the north of England 
(showing its hardiness). 
Main rachis 





& 
Eek 
COE 2752. 
Verruce 

The scales are left out. 
Spores biverrucose ; primary verruce small. 
PoLysTICHUM ANGULARE, or more properly, as Mr. Moore 
says, “ P. setiferum’” (Forskal, 1775), if it prove a species, in its 
usual average growth is 
much more thickly cover- 
ed with scales, and those 
of a lighter colour and 
less robust than in P. acu- 
leatum. It is also more 
lax or drooping in habit, 
and papery in texture. 
The pinnule are usually 
more stipitate, and their 
stalks much finer or hair- 
like than the last species. 
The rotundity of the pos- 
terior side* of the pin- 
nula at a, and the angle 
at which it is attached to 
the pinna at B, are its 
chief peculiarities (and to 
Main rachis 






yl a 
pinnt___ 
Spore 
The scales are left out. 
those who have studied the habits of the two plants growing 
* Posterior with reference to the pinna. 
