OCCURRENCE AND DISTRIBUTION. 55 



existence. One need, therefore, waste no time in 

 looking for a rich harvest of lichens in city parks, 

 along much-travelled roadsides, in woods that are fre- 

 quently run over by cattle, sheep, and oth'^r animals. 

 Seek the highest and wildest hills in your locality; if 

 there are none, search through the timber-lands; if 

 that particular locality is without hills, mountains, and 

 timber, devote yourself to the orchard, the fences, old 

 buildings, trees along roadsides, etc. Make the best 

 of your locality and make excursions to other more 

 favorable areas. Further particulars in regard to the 

 occurrence of lichens will be given in the description 

 of genera and species. 



