236 



MINNESOTA BOTANICAL STUDIES. 



area, but a locality where northern and more temperate floral ele- 

 ments meet seems to compensate full}'- at least for difference in 

 latitude. 



The genera giving most of the species new to the state are 

 the following, given in tabular form with the total number of 

 species collected in each genus and the number new to the 

 state. 



Ramalina^ collected 6, new to t 



Cetaria^ " 7, " 



Sticta^ " 5, " 



Nephroma^ " 4, " 



Solorina^ " i, '•'• 



Lecanora^ " 2^^ " 



Gyalecta^ " i, " 



Bceomyces^ " 2, " 



Biatora^ " 33, " 



Heterotheciufn^ " 2, " 



Lecidea^ " 12, " 



Caltciiim^ " 9, " 



Coniocybe^ " i, " 



Sagedia^ " i, " 



Of these genera Solorina, BcBomyces, Heterothecium, Cah'c- 

 tum, Coiiiocybe, and Sagedia are new to the State. An inspec- 

 tion of the above list shows that the genera are for the most 

 part those furnishing large numbers of arctic and subarctic 

 species, or species hitherto supposed to be confined to New 

 England. The genera Stereocaulon and Umbilicaria are 

 equally characteristic of northern and eastern areas, but two- 

 thirds of the species of these genera here recorded were listed 

 for Minnesota in the first paper of this series. 



By comparing the present list of species and varieties with 

 those recorded for Minneapolis and Taylors Falls we find that 

 that there are 152 lichens growing in the territory considered in 

 this paper and not found in either of the two areas named above, 

 while there are 33 found in them and not in the northeastern 

 Minnesota area under consideration. This leaves only 73 

 lichens known to be common to central and northeastern Min- 

 nesota. In the comparison between Minneapolis and certain 

 localities in northeastern Iowa it was shown that no species have 

 been found at the former place and not in the latter region, 

 though Minneapolis is 150 miles north of Fayette, the principal 

 Iowa area considered. In passing about 200 miles north from 



