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Asplenium septentrionale (L). Hoffm. Dry rock crevices. Albany Co. 



Asplenium Trichomanes L. Dry granite cliffs. Albany Co. 



Asplenium viride Huds. Alpine rocks. Teton Co. 



Athyrium americanum (Butters) Maxon. In rock slides, among boulders, 

 typically alpine. Teton Co. 



Athyrium Filix-foemina (L.) Roth. In moist, shady places, aspen thickets, 

 along streams. Big Horn Co., Teton Co., Yellowstone Nat. Park. 

 fBotrychium lunaria (L.) Sw. Moist meadow. Sheridan Co. 

 fBotrychium Coulteri Underw. In wet soil and lake shores. Teton Co., Yel- 

 lowstone Nat. Park. 



fBotrychium silaifolium Presl. Willow thickets and lake shores in wet soil. 

 Sublette Co., Teton Co. 



Cheilanthes Feei Moore. Crevices in large, dry rocks, usually on limestone 

 cliffs. Albany Co., Johnson Co., Natrona Co., Platte Co. 



Cryptogramma acrostichoides A. Br. Rock slides, alpine. Albany Co., Car- 

 bon Co., Lincoln Co., Sheridan Co., Sweetwater Co., Teton Co., Yellowstone 

 Nat. Park. 



Cystopteris fragilis (L.) Bernh. Rock crevices, usually in less exposed places. 

 Albany Co., Big Horn Co., Carbon Co., Converse Co., Crook Co., Lincoln Co , 

 Park Co., Sheridan Co., Sublette Co., Yellowstone Nat. Park. 



Dryopteris Filix-mas (L.) Schott. Shady ravines on moist soil. Albany 

 Co., Natrona Co., Sheridan Co. 



fMarsilia oligospora Goodding. Mud flats and shallow water at margins 

 of lakes. Sublette Co., Teton Co. 



Notholaena Fendleri Kunze. Collected but once in a rocky canyon at lower 

 elevations. Albany Co. 



Pellaea Breweri Eaton. In rock crevices. Carbon Co., Sublette Co. 



Pellaea densa (Brack.) Hook. Rock crevices, alpine. Teton Co. 



Pellaea occidentalis (E. Nels.) Rydb. Dry rock crevices, prefers limestone. 

 Albany Co., Big Horn Co., Natrona Co. 



fPhegopteris Dryopteris (L.) Fee. Collected but once, but locally common 

 in a rock slide in Jackson's Hole. Teton Co. 



Polypodium hesperium Maxon. Collected but twice, in rock crevices in dry, 

 granite cliffs. Albany Co. 



Polystichutn lonchitis (L.) Roth. In rock crevices and cliffs. Carbon Co., 

 Lincoln Co., Teton Co. 



Pteridium aquilinum (L.) Kuhn. In open aspen groves. Carbon Co., 

 Lincoln Co., Sheridan Co., Teton Co., Yellowstone Nat. Park. 



Woodsia oregana Eaton. Among rocks in shady places. Crook Co., Lincoln 

 Co. 



Woodsia scopulina Eaton. Among rocks in shady places. Albany Co., 

 Carbon Co., Park Co., Sheridan Co., Sublette Co., Yellowstone Nat. Park. 



Equisetum arvense L. Sandy soil in open situations. Albany Co., Park Co., 

 Sheridan Co., Yellowstone Nat. Park. 



# Equisetum fluviatile L. Swamps and edges of streams. Teton Co. 



Equisetum hiemale L. Moist alluvial soil, stream banks. Albany Co., Con- 

 verse Co., Johnson Co., Park Co., Sheridan Co., Teton Co., Yellowstone Nat. 

 Park. 



