Fink: THE LICHENS OF MINNESOTA. 719 



39. Pannaria laiiguinosa (Ach.) Kcerb. 



On shaded rocks and mosses, common. June 30, 1896, no. 51; 

 July 11, 1896, no. 157. 



The pale sulphur-colored form common in Europe, but not 

 before reported for the American lichen, occurs on the Saint 

 Peter sandstone. It has also been collected by the writer on 

 the same rock formation in Iowa. 



Not previously reported from Minnesota. 



40. Pannaria nigra (Huds.) Nyl. 



On calcareous rocks, rare. July 13. 1896, no. 138. 

 Not previously reported from Minnesota. 



41. Omphalaria sp. 



On calcareous rocks, rare. July 30, 1896, no. 196. Thallus 

 of small black fronds, rounded above, and the larger ones be- 

 coming somewhat roughened and lobed. Apothecia innate and 

 frequently several in a frond. Spores simple, colorless, |£| mik, 

 numerous in asci. Gonimia in clusters. Probably a new spe- 

 cies. 



42. Collema flaccid am Ach. 



On trees, rare. June 19, 1896, no. 18. 

 Not previously reported from Minnesota. 



43. Collema pulposum (Bernh.) Nyl. 



On clayey earth, infrequent. June 28, 1896, no. 28; June 25, 

 1896, no. 14; July 20, 1896, no. 179. 

 Not previously reported from Minnesota. 



44. Leptogium lacerum (Sw.) Fr. 



On calcareous rocks among mosses, rare. July 20, 1896, 

 no. 139. 

 Not previously reported from Minnesota. 



45. Placodium elegans (Link.) DC. 



On calcareous rocks, rare. July 31 1896, no. 225. 



46. Placodium einnabariuum (Ach.) Anz. 



On granitic and calcareous rocks, rare. July 3, 1896. no. 69; 

 July 10, 1896, no. 109. 

 Not previously reported from Minnesota. 



47. Placodium microphyllinum Tuck. 



On dead wood, rare. July 11, 1896, no. 182a. 

 Not previously reported from Minnesota. 



