^IS8 GEOLOGICAL SURVEY OF CANADA. 



Var. muscorum, Koerb. 



Chiefly on mosses in alpine and arctic regions, 



Islands in Behring Strait. (Wright.) On moss at the bases of 

 trees, Salt Lake, Anticosti, Que. ; on earth in woods at Banff, 

 Rocky Mountains, 1891. (Macoun.) 



Var. achrista, Sommerf, 



On trees and shrubs. 



On bark of trees along Lake Winnipegosis, and on Moose 

 Mountain, Man., July, 1880.^ on cherry bark at Old Wives' Creek, 

 Assa., May, 1895 ; on poplar bark along Jumping Pound Creek, 

 Rocky Mountains, June, 1897. (Macoun.) 



Var. pilularis, DC. 



On limestone rocks along the Rideau River near the Hogsback, 

 May 7th, 1897 ; at Aylmer, Que., April, 1900. (Macoun.) 



441. L. vorticosa, Koerb. 



On alpine and arctic granitic rocks. 

 Arctic America. (Fries,) 



442. L. pycnocarpa, Koerb. 



Granitic rocks. Island of Grand Manan, N.B. ( Willey.) 



443. L. arctica, Sommerf. 



Upon mosses in alpine and arctic regions. 



Greenland. (Vahl.) Islands in Behring Strait. (Wright) 



444. L. planetica, Tuckerm. var. perfecta, Eckfeldt. 



On limestone shingle at Britannia, near Ottawa, Ont., April 

 20th, 1895. (Macoun.) 



445. L. limosa, Ach. 



On naked earth in alpine and arctic regions. 

 Greenland and Arctic America. (Fries.) 



