740 MINNESOTA BOTANICAL STUDIES. 



papillae on both sides of the leaf, and two cell layers part way 

 across the leaf. I had already decided to honor this bistratose 

 character with a varietal name, when I came upon and took to 

 heart Limpricht's remark under this very species. In his 

 Laubmoose. 1:140, he says: "In Bryol. eur. Schimper 

 has afflicted with names a- long series of forms (of Andreaea 

 petrophila), and has figured them on tab. 624, 625; however, 

 the arranging of an abundance of material in accordance there- 

 with is a thankless task, for in this sense the circle of forms is 

 without limit in every common species." At any rate, until I 

 can have the opportunity of critically examining some of the 

 Old World forms of this species, especially the high altitude 

 forms, it seems best to let the plant rest under its old specific 

 name. 



2. Cynodontiuni virens var. wahleabergii B. S. Sterile. 

 Collected near the 13,000 feet level, with Pogonatum al- 



pinum. 



3. Dicranum albicans B. S. Sterile. 



On ground, at an elevation of over 13,000 feet. 



4. Distichium capillaceum (Sw.) Bry. eur. Sterile. 

 This is apparently the high alpine, short- leafed form named 



var. brevifolium Bry. Eur. and referred to in Limpr. Laubm. 

 p. 515. Collected above 13,000 feet. Not uncommon. 



5. Barbula fragilis B. S. Sterile. 



This plant is smaller than that occurring near Winona; but 

 in all respects, otherwise, even to the broken leaf points, it 

 agrees with it. Only one small sod was found at 13,000 feet. 



6. Barbula mucronifolia B. S. 



Occurred in two places near 13,000 feet altitude. 



7. Barbula miilleri B. S. Sterile. 



This determination is doubtful. The plants are smaller than 

 usual, if it is this. Common from 13,000 to 14,000 feet. 



8. Grimmia apocarpa Hedw. 

 Collected near the top of the mountain. 



9. Crrimmia cominutata Hub. 



An abundant moss from 10,000 to 13,500 feet. 



