Fink: rock lichens op- tavloks falls. 17 



62. Cladonia gracilis (L.) Nyl. var. verticillata, Fr. 

 On sandstone, no. 116. 



63. Cladonia delicata (Ehrii.) Fr. 



On old wood among igneous rocks, nos. 79^^ and 67. 

 Not previously reported from Minnesota. 



64. Cladonia rangiferina (L.) Hoffm. 

 On earth among igneous rocks, no. 81. 



65. Cladonia rangiferina (L.) Hoffm. var. alpestris L. 



On earth among igneous rocks, no. 82. 



66. Cladonia macilenta (Ehrh.) Hoffm. 



On old roots among igneous rocks, no. 79'' and 80''. 



67. Biatora rufonigra Tuck. 

 On igneous rocks, no. i. 



Not previously reported from Minnesota. 



68. Biatora coarctata(SM. Nyl.) Tuck. var. brajeriana Sch^r. 

 On sandstone, no. 92. 



Not previously reported from Minnesota. 



69. Biatora myriocarpoides (Nyl.) Tuck. 



On sandstone, no. 100. Habitat unusual, but I cannot distin- 

 guish sufficiently between this and my wood specimens to separate 

 them. 



Not previously reported from Minnesota. 



70. Lecidea albocaerulescens (Wulf.) Sch^r. 

 On igneous rocks and sandstones, no. 27. 

 Not previously reported from Minnesota. 



71. Buellia spuria Arn. 



On igneous rocks, no. 22. 



Not previously reported from Minnesota. 



72. Buellia petraea (Flot., Koerb.) Tuck. 

 On igneous rocks, no. 58. 



Not previously reported from Minnesota. 



73. Buellia petraea (Flot., Koerb.) Tuck. var. montagnaei 

 Tuck. 



On igneous rocks, no. 89. 



Not previously reported trom Minnesota. 



74. Buellia petraea (Flot., Koerb.) Tuck. var. grandis 

 Floerk. 



