Fink : I.ICHKNS OF THE LAKE SUPERIOR REGION. 227 



conspicuous forms. The remaining one-third are some of the 

 less conspicuous B/a/oras, Lcc/dcas, Bucllias, Graphiscs, 

 Pyrcmdas^ etc., which are not easily found. 



When we consider the limited size of the area studied, the 

 restriction of certain of the rarer species to certain parts of it 

 rather than to others is worthy of careful study. The area lies 

 on two sides of a divide extending approximately east and west 

 and formed of the Mesabi range and the Misquah hills. The 

 alpine or sub-alpine species not generally distributed over the 

 area are mostly confined to the portion lying between the divide 

 and lake Superior and to the Misquah hills on the divide, and 

 also those found along the lake are for the most part found 

 toward the northeastern portion of the territory traversed. The 

 rarer temperate region species on the other hand are most 

 numerous to the north and west of the divide, or toward the 

 south of the portion between the lake and the divide. All of 

 the data given above as to distribution within the area studied 

 are based upon carefully prepared lists showing the distribution 

 of each species. They can not all be reproduced, but parts of 

 them must be. First of all, the facts concerning the species 

 found only in one place can only be properly presented for con- 

 sideration by the somewhat laborious table below, giving the 

 various localities and species for each. 



Grand Portage Island. 

 Usnea cavernosa Tuck., N. 

 Physcia hispida (ScHREB.) Fr., N. 

 Solorina saccata (L.) Ach., N. 



Lecanora calcarea (L.) Sommerf. var. contorta Fr., T. 

 Cladonia gracilis (L.) Nyl. var. symphycarpia Tuck., T. 

 Cladonia squamosa Hoffm. vav. phyllocoma Rabenh., T. 

 Cladonia deformis (L.) Hoffm., N. 

 Baeomyces byssoides (L.) Schaer., N. 

 Biatora turgida (Fr.) Nyl., T. 

 Lecidea spirea Acn., N. 

 Endocarpon miniatum (L.) Schaer., T. 

 Lecidea crustulata Ach., N. 

 Lecidea enteroleuca Fr. var. achrista Sommerf., T. 



