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of the larger pinnae deeply pinnatifid ; margin 
of lobes notched and spiny. Rachis green. 
Stipes about half the length of the entire 
frond, dark coloured, and covered with jagged 
scales. The whole frond has a crisped ap¬ 
pearance, owing to the edges of all the 
pinnules being slightly curved upwards ; its 
surface is covered with minute, round glands, 
which are supposed to emit the peculiar hay¬ 
like odour of this fern. 
Growth. Fronds rising in a circle from the crown, . 
and when mature, recurved and drooping. 
Height. From six inches to two feet. 
Colour. Pale green. 
Habitats. Damp sheltered situations. Pretty gene¬ 
rally distributed, hut not very abundant. More 
common in the western counties, and in Ire- 
land. 
GROUP I; GENUS X; SPECIES V. 
LASTREA OREOPTERIS. (Mountain Fern.) 
Plate XIII. 
Fronds. Lanceolate, pinnate. Pinnae linear-lan¬ 
ceolate, deeply pinnatifid; the longest pair 
at about two-thirds the height of the frond 
from the ground. Lobes oblong, and nearly 
smooth on margin. The under surface of 
