KUSTS IN COLORADO 7I 



knowledge of the rust-flora of the state enabling us to reach 

 most Interesting localities without loss of time. 



Our first observations were made at Eldorado Springs, 

 an hour's ride north of Denver. Here were seen brilliant 

 yellow ascia on Arabis, uredinia on Cerastium, and telia on 

 Poa and a number of other grasses, but the only observation 

 in line with the object of our explorations was made on 

 Agropyrou rust. The abundance of the rust on the wintered- 

 over leaves at the opening of the principal caiion seemed a 

 good omen for our final success, and when we came across a 

 few pycnia on half grown leaves of Clematis Ugusticifolia, 

 W'hich lay in contact with the rusted grass, and could find 

 no other rusts in the immediate vicinity, we were greatly 

 elated, for it would seem that we had found the true Puc- 

 cinia Agropyri E. & E., which European botanists have identi- 

 fied with Aecidiiim CJeinatidis DC, but which has not been 

 proven with American material.* 



The next morning at eight o'clock, in company with 

 Mr. Bethel as guide, we set out for a cross-country, all-day 

 tramp to Boulder, four miles away as the crow flies, but seem- 

 ingly quadruple that distance as we went over the foothills, 

 first climbing abruptly, then dropping into a deep caiion, or 

 zigzaging back and forth along the mountain side to shun 

 precipitous slopes. The clouds hung low all day, shutting 

 out of view the mountains and distant landscape, and toward 

 evening the fogs rolled up the valleys from the low land. 

 Being restrained from the enjoyment of the scenery, enabled 

 us to give undivided attention to the rusted vegetation at 

 our feet. As we studied one situation after another enthus- 

 iasm ran high, and could not be checked even by the cold 

 wind and occasional flurries of snow. 



We found a number of grass and sedge rusts during 

 this tramp, some in great abundance, but the only one requir- 



* Owing to delay in sending this article to the printer, it is possible 

 to append the results of the after study of the material. For record of 

 successful cultures with Agropyron rust see .lour. Myc. 14:12. 1908. 



