Polypodiaceae 7 



2-4 feet long, 1-3 feet wide, ternate, the 

 three branches each bipinnate, the upper 

 pinnules undivided, the lower more or less 

 pinnatifid. 



In dry woods, thickets, and open hillsides, 

 throughout the region. 



Rootstock stout, short, and 



chaffy; stems densely tufted, 

 ma acrosti- 



choides R. straw-colored, 2-6 inches long, 

 Br. Amer- very slender, chaffy below; 

 ican Rock- leaves ovate or ovate-lanceolate 



brake. . . .. , 



in outline, thin, smooth, 2-3 



pinnate, the sterile shorter than the fertile, 

 their segments and pinnules crowded, ovate- 

 oblong or obovate, crenate or slightly sharply 

 cut ; fertile leaves with linear or linear oblong 

 segments half an inch long, the margins at 

 first rolled back to the midrib, at maturity 

 expanded and exposing the light brown 

 sporanges. 



Forming tufts among rocks through- 

 out the region but most frequent in the 

 Selkirks. 



