MOUNTAIN FERN. 95. 
» 19. MOUNTAIN FERN. Montana. 
um montanum, Vogler. 
um Oreopteris, Ehrhart. 
1 129. 
: ioates of the Mountain Fern is large, scaly 
tufted. In favourable situations this sends forth 
y - ey fronds, which spread with but little 
a common centre: immediately these 
n to unrol they exhibit the pinne, placed at right 
8 with the main rachis, and are not convolute, a 
er worthy of particular notice, because unusual. 
fronds, when fully expanded, are very variable in 
Sependent chiefly on situation, but also in a great 
ant; these, for two or three years, bear little or 
d, but after the third year seed appears in 
, and from that period all the fronds are 
In the form of the frond there is little or no 
elongate-lanceolate, and regularly pin- 
seas are 0 aged distant, pinnatifid, acute at 
ually diminishing from about two- 
jee. to the very base, the lower 
remarkably short and nearly triangular i in 
mnuation of the frond towards the base 
eter, and is of itself sufficient to 
