POLYSTICHUM. 1G1 



climate of Ireland seems more congenial to it, and we un- 

 derstand it is there cultivated with facility. The fronds 

 are narrow in outline, their figure being linear-lanceolate ; 

 they are once pinnate, the pinnae being short, crowded, and 

 somewhat crescent-shaped, the upper side at the base having 

 an ear-shaped projection, the lower side being, as it were, 

 cut away. The margin is set with spinous teeth. 



The veins are twice branched, the branches extending to 

 the margin without joining with others. The clusters of 

 spore-cases form a line parallel with, and on each side of the 

 midrib, and are covered each by a membranous circular scale, 

 which is attached by a short central stalk. 



A true rock-Pern, occurring on the bleak mountains of 

 Scotland and in the milder climate of Ireland, as well as 

 rarely in the north of England and in Wales. It is a very 

 distinct, and, when vigorous, a not inelegant species, but 

 exceedingly difficult of cultivation, and seldom seen thriving 

 under artificial treatment. 



The Holly Pern has been at different times called Aspi- 

 dium Lonchitis and Polypodmm Lonchitis. 



