BLADDER FERNS. 



99 



closed case. "Under no condition have we at present 

 tested its qualities. 



MOUNTAIN BLADDEE PEEN * 



This fern has a slender, creeping root-stock, from which 

 the fronds do not often rise more than 5 or 6 inches. The 

 general outline of the frond is triangular, with branches 

 proceeding on either side from the stalk of the frond. 

 The lowest pair of branches are nearly as long as the leafy 

 portion of the frond, but those above them diminish rapidly 

 in length towards the end of the frond. The branches,. 



* Cystopteris montana, Bernh. 



7—2 



