18 MINNESOTA BOTANICAL STUDIES. 



On igneous rocks, no. 89''. Thallus coarser, more crowded 

 and lighter colored. Hypothallus deficient. 

 Not previously reported from Minnesota. 



75. Endocarpon miniatum (L.) Sch^r. 

 On igneous rocks and sandstone, no. 41. 



76. Endocarpon hepaticum Hedw. 

 On sandstone, no. 97. 



77. Verrucaria fuscella Fr. 

 On igneous rocks, no. 21. 



78. Verrucaria muralis Ach. 

 On sandstone, no. 107. 



79. Thelocarpon prasinellum Nyl. 

 On old boards, no. 113. 



Not previously reported from Minnesota. 



