226 MINNESOTA BOTANICAL STUDIES. 



are doubtless quite generally distributed over the territory sur- 

 veyed. Of these found in two or three places, 13 more were 

 found along the lake and inland, but none beyond the divide 

 mentioned above. These are doubtless generally distributed 

 between this highest land and lake Superior, and of course may 

 occur northwest of this high area as well. 



Of course the 133 or more species most generally distributed 

 over the area largely determined the character of its flora and 

 are interesting in studving the relation of the flora of the region 

 to that of others. But for the study of distribution within the 

 area, as influenced by natural conditions, the chief interest cen- 

 ters around the 96 species found in one place only and those 

 found in two or three areas and yet not generally distributed 

 over the whole region. I give below a list stating the whole 

 number collected in each principal collecting ground and also 

 the number found at each one and not elsewhere. It will readily 

 be seen that the last datum for each locality simply bears a close 

 relative proportion to the first, or in other words, that no one 

 area shows a large relative proportion of the rare species. Of 

 course the data as to occurrence of these rare lichens can not be 

 relied on fully ; but about two-thirds of them are species of size 

 large enough to be easy of detection, and while these may occur 

 in other places, they are surely not common in the area. The 

 table of species is as follows : 



Grand Portage island, total collected, 88, not found elsewhere, 15 



Grand Portage, " " 59, " " " 12 



South Fowl lake, " " 14, " " " i 



Rose lake, " " 20, " " " 3 



Gunflint, " " 118, " " " 12 



Misquah hills, " " 115, " " " n 



Tofte, " " 85, " " " 8 



Beaver Bay, " " 82, " " " 13 



Palisades, " " 33, " " " i 



Two Harbors, " " 14, k ' " " 2 



Ely, " " 41, " " 3 



Snowbank lake area, " " 121, " " " 15 



The rather high per cent, of forms collected at Grand Port- 

 age only is due to the fact that the attempt was made to collect 

 here especially species not found on the island. At an average 

 about one-eighth of the species collected in each locality were 

 not found elsewere. As stated above, two-thirds of these are 



