50 UNIVERSITY OF MISSOURI STUDIES [198 



evenly, but not abundantly distributed throughout in moist 

 rocky canons, 6000-8600 ft. (Daniels, 555). 



Nova Scotia and Michigan to Alaska; New Mexico and 

 Colorado to California. 



4. WOOPSIA R. Br. 



4. W. scopulina D. C. Eaton. Cliff Woodsia. 



The most abundant fern of the foot-hills and lower moun- 

 tainsides, occurring wherever rocks are exposed to the sur- 

 face, 5700-8100 ft. (Daniels, 156). 



Michigan to British Columbia; Colorado and Arizona 

 to California. 



5. W. Oregana D. C. Eaton. Mountain Woodsia. 



With the preceding, but much scarcer, and ranging to the 

 timberline or above, 5600-1 1000 ft. (Daniels, 361). Long's 

 Peak (Coulter in Wabash College Herb.). 



Michigan to British Columbia; Colorado and Arizona 

 to California. 



5. FILIX Adans. Bladder-fern. 



6. F. fragilis (L.) Underw. [Cystopteris fragilis Bernh.]. 



Fragile-fern. 

 Throughout on the moister rocks; apparently the only 

 fern of the plains region, 5100-13000 ft. (Daniels, 23). 

 Almost cosmopolitan. 



6. PTERIDIUM Scop. Bracken. 



7. P. aqiulinum pubescens Underw. Hairy brake. 



Caiions of Green Mt., and gulches at the foot of the Flat- 

 irons; Bear Canon; local, but abundant where found, 5800- 

 lOOOO ft. (Daniels, 277) 



Montana and Colorado to Arizona and California. 



7. CEYPTOGRAMMA R. Br. Parsley-fern. 



8. C. aerostichoides R. Br. Rock parsley-fern. 



High ridges of rock, descending on Green Mt. to about 

 6500 ft., thence to above iiooo ft. (Daniels, 271). 

 Michigan to Alaska; Colorado to California. 



