314 MINNESOTA BOTANICAL STUDIES. 



52. Omphalaria kansana TUCK. 



On limestone, locally frequent. Mankato, June 23, 1899, 

 no. 27. 



Not previously reported from Minnesota. 



53. Omphalaria pulvinata NYL. 



On limestone, rare. Mankato, June 27, 1899, no. 148. 

 Not previously reported from Minnesota. 



54. Omphalaria phyllisca (WAHL.) TUCK. 



On granitic rocks, rare. Redwood Falls, July 6, 1899, no - 

 360, and July 8, 1899, nos. 338 and 343. Granite Falls, July 

 17, 1899, nos. 572 and 584. 



Not previously reported from Minnesota and new to the 

 Mississippi valley. 



55. Collema pycnocarpum NYL. 



On trees and once on rocks, generally distributed in the 

 Minnesota valley, but rare. 



Mankato, June 23, 1899, no. 60, and June 24, 1899, nos. 89 

 and 97. Mankato (Minneopa Falls), June 27, 1899, no. 136. 

 Redwood Falls, July 6, 1899, no. 309, and July 8, 1899, no. 

 355. Granite Falls, July u, 1899. no. 380. 



56. Collema flaccidum ACH. 



On trees and rocks, rare. Mankato, June 23, 1899, no. 81. 

 Mankato (Minneopa), June 27, 1899, no. 137. New Ulm, July 

 5, 1899, no. 278. 



57. Collema pulposum (.BERNH.) NYL. 



On earth and rocks, common in first locality. Mankato, 

 June 22, 1897, no. 3, and June 23, 1899, no. 79. Granite 

 Falls, July u, 1899, no. 417. 



58. Collema tenax (Sw.) ACH. 



On earth, rare. Mankato (Rapidan), June 28, 1899, no. 169. 

 Not previously reported from Minnesota. 



59. Collema plicatile SCHAER. 



On calcareous rocks, locally frequent. Mankato, June 23, 

 1899, no. 28. 



Not previously reported from Minnesota. 



60. Collema pustulatum ACH. 



On calcareous rocks, rare. Mankato, June 26, 1899, no ' 

 in. 



Not previously reported from Minnesota. 



