Polypodiaceae 13 



out, lanceolate, 6-12 inches long, tapering 

 from about the middle to both ends ; pinnae 

 numerous, oblong-ovate, pinnatifid into ob- 

 long-toothed segments ; sori nearly marginal. 

 In crevices in the rocks and among broken 

 stones on slides, throughout the Rockies, up. 

 to an elevation of 7000 feet; frequent. 



Rootstock short; stems smooth, 

 Woodsia 



brownish below. Leaves smooth, 



D.C.Eaton. 2-io inches long, lanceolate; 

 Oregon pinnae triangular, oblong, obtuse, 



Woodsia. pinnatifid, lower ones rounded 

 and somewhat remote from the others; 

 rachis straw-colored; pinnules oblong-ovate, 

 dentate or crenate, the teeth often turned 

 back and covering the submarginal sori. 



Among broken stones on the slides near 

 the base of Mt. Stephen in the Rockies. 



Rootstock short; stems 4-8 

 Filix fragilis 

 (L.) Un- inches long, leaves thin, smooth 



derw. Brit- throughout, oblong-lanceolate, 

 tie Fern. on iy slightly tapering below, 

 4-10 inches long; pinnate or 2-3 pinnatifid; 



