240 MINNESOTA BOTANICAL STUDIES. 



age. Yet fewer forms of lichens were collected about Snow- 

 bank lake. This seems to indicate that the lake shore is richer 

 in lichen species than in interior areas of the territory studied. 



It is well known that a large portion of the species of lichens 

 of the interior of North America are those found also in regions 

 bordering upon the Atlantic ocean along our eastern border. 

 This was brought out by the writer in a previous paper,* but 

 all the species recorded in that paper were temperate region 

 lichens. It has remained for the present paper to record a large 

 number of more northern lichens previously for the most part 

 known onh^ in arctic or subarctic regions, or descending from 

 mountains farther south only along our Atlantic border. 



Of the 258 species and varieties listed below 46 are new to 

 the North American interior or to the interior of the United 

 States, and of these six are new west and north of New Eng- 

 land. In treating of distribution the expression " the interior of 

 North America '" means the area lying between the Appalachian 

 system of mountains on the east and the Rocky Mountains on 

 the w^est. A number of species noted as new to the interior 

 have been reported from New York or Canada, and doubtless a 

 few of them were previously found a short distance west of the 

 Appalachian system of mountains. 



LIST OF SPECIES AND VARIETIES. 



1. Ramalina calicaris (L.) Fr. var. fastigiata Fr. 



On trees, rare. Beaver Bay, July 13, 1897, no. 677. 



2. Ramalina calicaris (L.) Fr. var, canaliculata Fr, 



On trees, rare. Snowbank lake area, July 23, 1897, no, 895. 

 Not previously reported from Minnesota. 



3. Ramalina calicaris (L.) Fr. var. farinacea Schaer. 



On rocks, common or frequent over whole area and rarely 

 found on trees also. Grand Portage island, June 23, 1897, no, 

 106. Gunflint, June 30, 1897, no, 257, Misquah hills, July 

 3, 1897, no. 419, and July 7, 1897, no. 539. Tofte, July 10, 

 1897, no, 624, Palisades, July 15, 1897, no, 763, Snowbank 

 lake area, July 24, 1897, no. 934. 



All except no. 763 were lighter colored than other forms of 

 the species. No, 106 occasionally and no. 763 quite commonly 



*Fink, B. Lichens of Iowa. Bull. Lab. of Nat. Hist., State Univ. of 

 Iowa. 3 : 70-78. Mr., 1895. 



