[Vol. 9 



144 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



480 n, in diameter, obscurely or more distinctly marked with low 



tubercles or wrinkles; microspores 23-30 u long, more or less 

 spinulose. 



Distribution: Idaho, Wyoming, Colorado, Utah, Arizona, Bri- 

 tish Columbia, Washington, Oregon, California. 



Specimens examined: 

 Idaho: Bitter Hoot Forest Reserve, alt. 2050 m., 26 August, 



lsi)7, Leiberg 39 (Mo. Bot. Gard. Herb.); head of Bear 

 ('reek, Hitter Root Forest Reserve, alt. 2050 m., 26 August, 

 1897, U iberg 2989 (U. S. Nat. Herb.). 



Wyoming: shallow pond near falls of Yellowstone River. 1S7.'$, 



I'arry 301 (Mo. Bot. Gard. Herb.. N. Y. Bot. Card. Herb., 

 and Ciay Herb.); Yellowstone Park, June, September, 1885. 

 Tweedy 417 (U. S. Nat. Herb.); ponds, Snake River, 9000 

 ft., August, 1897, Tweedy 362 (N. Y. Bot. Gard. Herb.); 

 Yellowstone Lake, 12 August, 1897, Rydberg <v E. A. Bessey 

 3520 (U. S. Nat. Herb., N. Y. Bot. Gard. Herb., and Gray 

 Herb. ) ; Yellowstone Park, 4 August, 1902, M earns 2807 (U. 



S. Nat. Herb.) ; entirely submerged in shallow pond cut off 

 from north end of Yellowstone Lake. 16 August, 1900, C. E. 

 Bessey 2 (N. Y. Bot. Gard. Herb.). 



Colorado: ponds in Elk Mts., 1881, Brandegee 2001 (Mo. Bot. 



Gard. Herb.) ; lake in Gunnison River Valley, 10,000 ft. alt., 

 lake's near timber line, main range, Routt Co., September, 

 1891, Trelease (Mo. Bot. Gard. Herb.); (probably) sub- 

 merged on coarse granite bottom, Ward, Boulder Co., alt. 



2500 in., Clokey (Schmoll) 3986 (Mo. Bot. Gard. Herb.). 



Utah: subalpine lake, Alta, W T asatch Mts., 12 August, 1879, 



J ones (Mo. Bot. Gard. Herb, and II. S. Nat. Herb.); Alta, 

 Wasatch Mts., August, 1883, Jones (N. Y. Bot. Gard. Herb.). 





Arizona: in a lake about 2 miles east of Tunnel Road, Black Mes 



Forest Reserve, 1 June, 1900, Coville 1053 (U. S. Nat. 

 Herb.). 



British Columbia: Indian Reservation, Kamloops, 29 June, 1889, 



John Macoun 14212 (Gray Herb.) ; in 6 feet of water, Lake 

 Mara, Sicamous, 7 July, 1889, J. Macoun (N. Y. Bot. Gard. 

 Herb.). 



Washington: ponds, alt. G.'tOO ft., Cascade Mts., August, 1882, 



Tweedy ( Mo. Bot. Gard. Herb, and N. Y. Bot. Gard. Herb.) ; 



