310 MINNESOTA BOTANICAL STUDIES. 



13. Theloschistes concolor (DICKS.) TUCK. var. effusa TUCK. 

 On trees rare. Mankato, July i, 1899, no. 2i6a. 



14. Parmelia perforata (JACQ^) ACH. 



On trees, rare. Mankato, June 26, 1899, no. 134. 



15. Parmelia cetrata ACH. 



On trees and rocks, rare except at the last locality where the 

 plant is frequent. New Ulm, July 4, 1899, no. 228. Redwood 

 Falls, July 8, 1899, nos. 329 and 360. Granite Falls, July 12, 

 1899, no. 455, and July 17, 1899, nos. 550, 573 and 574. 



1 6. Parmelia crinita ACH. 



On trees and granitic rocks, rare. Mankato, June 23, 1899, 

 no. 47. Mankato (Minneopa Falls), June 27, 1899, no. 133. 

 New Ulm, July 5, 1899, no. 258. Granite Falls, July n, 

 1899, nos. 400 and 439. 



17. Parmelia borreri TURN. 



On trees and granitic rocks, common. Mankato, June 22, 

 1899, no. ii. New Ulm, July 5, 1899, no - 2 ^8. Redwood 

 Falls, July 8, 1899, no. 335. Granite Falls, July n, 1899, nos. 

 383 and 389. 



18. Parmelia borreri TURN. var. rudecta TUCK. 



On trees and old wood, infrequent. Mankato, June 23, 1899, 

 no. 12, and July 23, 1899, no. 58. 



19. Parmelia borreri TURN. var. hypomela TUCK. 



On shaded granite rocks, rare and sterile. New Ulm, July 

 5, 1899, no. 287. 



20. Parmelia tiliacea (HOFFM.) FLOERK. 



On trees, infrequent. Mankato, June 23, 1899. 



21. Parmelia saxatilis (L.) FR. 



On trees and rocks, rare. Mankato, June 26, 1899, no - IO ^- 

 New Ulm, July 5, 1899, no - 2 ^4- Redwood Falls, July 8, 

 1899, no - 34 1 - Granite Falls, July n, 1899, no. 414. 



22. Parmelia saxatilis (L.) FR. var. sulcata NYL. 



On old wood and shaded rocks, rare. Mankato (Rapidan), 

 June 28, 1899, no. 165. Granite Falls, July 17, 1899, no. 586. 



23. Parmelia saxatilis (L.) FR. var. panniformis (Acn. 



(SCHAER. ? 



On shaded rocks, rare. New Ulm, July 5, 1899, no. 268. 

 Granite Falls, July 17, 1899, no 561. 

 The plant is placed here provisionally. 



