.MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 5 



In size and general habit it resembles most P, Brczuen\ but the 

 leaves are decidedly coriaceous, the stipe more slender and less 

 plainly septate. It has also been regarded as a depauperate form of 

 P. afropurpu7'ca, from which it differs in the smaller size, the more 

 tufted habit, the broader pinnae of the fertile fronds, and the scarcity 

 of hairs or scales on the stipe. In P. atropnrparea, the pinnae of 

 the fertile fronds are almost linear, much narrower than those of the 

 sterile fronds. In crevices of exposed rocks. P. atropurpiirea is 

 most at home in more shaded places, but apparently lacking alto- 

 gether in Montana. 



Montana : Belt Mountains, 1884, J. S. Newberry ; Silver Bow 

 Co., Mrs. Jennie Moore; Tenderfoot Creek, R. S. Williains, 2^1. 



It has also been collected in the following states : 



Wyoming : Laramie Hills, 1896, Ave)i Ncho)i, igig. 



South Dakota: Black Hills, 1892, Rvdberg, iigi (type). 



Washington: W. Klickitat Co., 1892, W. JV. Sicksdorf, 2o8j. 



Pteris aquilina L. Sp. PI. 1075 [Ferns of N. A. i : 263 ; Our 

 Nat. Ferns, 91 : Man. R. M. 442 ; 111. Fl. i : 28 ; Bot. Cal. 2 : 



341]- 



In woods at an altitude of about 1000 m. 



Montana: Columbia Falls, 1892, /?. 6'. Williams, ^28 ; Missoula, 

 1898, Williams d- Griffith. 

 Cryptogramma acrostichoides R. Br. in Frankl. Journ. App. 767 



[Ferns of N. A. 2 : 99 ; Our Nat. Ferns, 97 ; Man. R. M. 441 ; 



111. Fl. i: 28; Bot. Cal. 2: 341]. 



Among shaded rock-slides at an altitude of 2-3000 m. 



Montana; Long Baldy, Little Belt Mts., August 19, 1896, 

 Flodman, 11 ; East Boulder, 1887, Tzveedy, 2pj ; North Fork, Sun 

 River, 1887, P. S. Williams, jii : Lake Plateau, 1897, P. Koch, 



35- 



Yellowstone Park : 1888, Rez-. Dr. Chas. H. Hall ; Obsidian 



Canon, 1884, Tweedy, y: 1883, J//55 Mary Compton ; Shoshone 



Lake and Lower Geyser Basin, Coulter. 



Polypodium vulgare L. Sp. PI. 1085 [Ferns of N. A. i : 237 : 



Our Native Ferns, 82 ; Man. R. M. 439; 111. Fl. i: 32; Bot. 



Cal. 2: 334]. 



It is rare in Montana, growing among rocks, ascending to an alti- 

 tude of a little over 1000 m. 



Montana: Columbia Falls, 1892, R. S. Williams, g2j. 



