312 MINNESOTA BOTANICAL STUDIES. 



33. Physcia tribacia (Ach.) Tuck. 



On wood, granite and quartzite, rare. Mankato, June 23, 

 1899, no. 77, and July i, 1899, no. 216. Granite Falls, July 

 14, 1899, no. 517. Pipestone, July 18, 1899, no. 601 and July 

 19, 1899, no. 634. 



34. Physcia cassia (Hoffm.) Nyl. 



On bowlders and all kinds of rocks in the region, except lime- 

 stone, frequent. Mankato, June 23, 1899, no. 76. New Ulm, 

 July 5, 1899, nos. 290 and 296. Granite Falls, July 12, 1899, 

 no. 443. Pipestone, July 18, 1899, nos. 618 and 624. 



35. Physcia obscura (Ehrh.) Nyl. 



On trees and rocks, common. Mankato, June 1899, no. 76a. 

 New Ulm, July 5, 1899, no. 289. Granite Falls, July 11, 1899, 

 no. 378, and July 17, 1899, no. 583. 



36. Physcia adglutinata (Floerk.) Nyl. 



On trees, frequent. • Mankato, June 23, 1899, no. 45. Gran- 

 ite Falls, July 11, 1899, no. 382 and July 13, 1899, no. 482. 



37. Pyxine sorediata Fr. 



On granitic rocks, rare. Granite Falls, July 17, 1899, no. 



578. 



38. Peltigera rufescens (Neck.) Hoffm. 



On earth and mossy rocks, frequent. Mankato, June 25, 

 1899, no. 48. Mankato (Minneopa Falls), June 27, 1899, no. 

 150. New Ulm, July 5, 1899, no. 251. Granite Falls, July 

 II, 1899, no. 395 and July 17, 1899, no. 559. 



39. Peltigera canina (L.) Hoffm. 



On earth and rocks, common. Mankato (Minneopa Falls), 

 June 27, 1899, no. 149. New Ulm, July 5, 1899, no. 262. 

 Granite Falls, July 11, 1899, no. 390, and July 17, 1899, no. 

 580. 



40. Peltigera canina (L.) Hoffm. var. spongiosa Tuck. 

 On earth, rare. Redwood Falls, July 8, 1899, "°- 357- 

 Not previously reported from Minnesota. 



41. Peltigera canina (L.) Hoffm. var. spuria Ach. 



On earth, rare. Mankato (Rapidan), June 28, 1899, no. 161. 



42. Peltigera canina (L.) Hoffm. var. sorediata Schaer. 



On earth and old wood, rare, Mankato, June 26, 1899, no. 

 121. New Ulm, July 5, 1899, no. 260. Granite Falls, July 

 13, 1899, no. 512. 



