THE CONTINENTAL RANGE OF THE MORE IM- 

 PORTANT LICHEN GENERA OCCURRING 

 IN THE UNITED STATES. 



The following table gives the general continental 

 range of the lichen-genera represented in the United 

 States. Some of the genera are not sufficiently known 

 to indicate their true range; such are marked with 

 an *. Those given under *' U. S." are perhaps about 

 uniformly distributed in the United States. 



