Fink: ROCK LICHENS OF TAYLORS FALLS. 13 



I am under great obligations to Dr. Charles P. Berkey for in- 

 formation concerning present and past geological conditions of 

 the area studied. My thanks are also due to Professor Conway 

 MacMillan for data concerning the distribution of the Conifers 

 between Taylors Falls and Lake Superior and to Mr. Geo. H. 

 Hazzard, of Taylors Falls, for the figures of annual precipita- 

 tion of moisture in the vicinity of Taylors Falls. 



LIST OF SPECIES AND VARIETIES. 



1. Ramalina calicaris (L.) FR. var. farinacea SCH^ER. 

 On igneous rocks and sandstone, no. 83. 



2. Usnea barbata (L.) FR. var. florida FR. 

 On igneous rocks and sandstone, no. 45. 



3. Usnea barbata (L.) FR. var. rubiginea MICHX. 

 On sandstone, no. 117- 



4. Theloschistes lychneus (NvL.) TUCK. 

 On igneous rocks and sandstone, no. 64. 



5. Theloschistes concolor (DICKS.) TUCK. 

 On sandstone, no. 102. 



6. Parmelia perforata (JACQ^) ACH. 

 On igneous rocks, no. 71. 



Not previously reported from Minnesota. 



7. Parmelia crinita ACH. 

 On igneous rocks, no. 66. 



8. Parmelia borreri TURN. 

 On sandstone, no. in. 



9. Parmelia saxatilis (L.) FR. 



On igneous rocks and sandstone, nos. 52 and 67. 



10. Parmelia olivacea (L.) ACH. 

 On igneous rocks, no. 60. 



u. Parmelia caperata (L.) ACH. 



On igneous rocks and sandstone, no. 50. 



12. Parmelia conspersa (EHRH.) ACH. 

 On igneous rocks and sandstone, no. 49. 



13. Physcia speciosa (WuLF. ACH.) NYL. 

 On igneous rocks and sandstone, no. 63. 



