(350 



A Preliminary List of Montana Mosses. 



By R. S. Williams. 

 (Plates 34 to 39.) 



The following list includes species collected by the author 

 at various times between the years 1886 and 1897. The re- 

 gion collected over includes but a comparatively small part 

 of the state, being chiefly that of Great Falls, on the Missouri 

 River, the Belt Mountains, fifty or sixty miles eastward, and 

 along the foothills of the Rocky Mountains in the Blackfeet 

 Indian Reservation, all belonging to the Missouri River water- 

 shed and about Columbia Falls, situated on the Flathead 

 River, just west of the Rocky Mountains and tributary to the 

 Columbia River. The town of Columbia Falls has an ele- 

 vation of about 3,200 ft. and is about two miles west of where 

 the Flathead River emerges from the mountains through Bad- 

 rock Canon. The mountains near rise about 4,000 ft. above 

 the town and snow of the preceding winter frequently lies on 

 their summit till August. The western slope has two or three 

 times the rainfall of eastern Montana and is well forested. 



For assistance in preparing this list the author is chiefly 

 indebted to Mrs. Britton, also to Professor Macoun who has 

 loaned many valuable specimens for comparison. The date 

 given is that of the species when in best fruiting condition. 



Sphagnum Warnstorjii viri.de Russow. Belt Mts., near 

 Neihart, 6,000 feet; Rocky Mts., North Fork Cut-bank Cr. 



(ii3). 



Sphagnum teres (Schimp.) Aongstr. On wet mountain side 



at head of Macdonald Lake. The globose antheridia when 



separated out on a slide are readily seen by the unaided eye 



(3H)- 



Sphagnum teres squarrosulum (Lesq.) Schlieph. Mac- 

 donald Lake (315). 



Andrecsa pctrophila Ehrh. Macdonald Lake, Aug. 3 

 (3161 



