Fink: ROCK LICHENS OF TAYLORS FALLS. 15 



tain as to species. I found the same plant in three or four lo- 

 calities in northern Minnesota. 



Not previously reported from Minnesota. 



31. Collema pulposum (BERNH.) NYL. 

 On earth among igneous rocks, no. 23. 



32. Collema flaccidum ACH. 

 On igneous rocks, no. 43. 



33. Leptogium tremelloides (L. FIL.) FR. 

 On igneous rocks, nos. 18, 25, 29 and 61. 

 Not previously reported from Minnesota. 



34. Leptogium chloromelum (SEV.) NYL. 

 On sandstone, no. 109. 



Not previously reported from Minnesota. 



35. Placodium elegans (LINK.) DC. 



On igneous rocks and sandstone, no/53- 



36. Placodium cinnibarinum (Acn.) ANZ. 

 On igneous rocks, no. 31 and 62. 



37. Placodium aurantiacum (LIGHT) NAEG. and HEPP. 

 On igneous rocks and sandstones, no. 57. 



A form with scanty thallus and biatorine apothecia, appear- 

 ing much like the next. 



38. Placodium cerinum (HEDW.) NAEG. and HEPP. var. sid- 

 eritis TUCK. 



On igneous rocks, nos. 38, 39 and 91. 



39. Placodium vitellinum (EHRH.) NAEG. and HEPP. 

 On igneous rock and sandstone, no. 3. 



40. Lecanora rubina (ViLL.) ACH. 



On igneous rocks and sandstone, no. 51. 



41. Lecanora subfusca (L.) ACH. 



On igneous rocks and sandstone, nos. 12 and 115. 



42. Lecanora subfusca (L.) ACH. var. coilocarpa, ACH. 

 On sandstone, no. 108. 



43. Lecanora atra ( HUBS.) ACH. (?) 

 On igneous rocks, no. 4. 



Not previously reported from Minnesota. 



44. Lecanora hageni ACH. 

 On sandstone, no. 118. 



45. Lecanora varia (EHRH.) NYL. 



On igneous rocks and sandstone, no. 68. 



