1898-1902. No. 21.] LICHENS. 53 



We see therefore that the fruticulose lichens to the amount of 88.5 % 

 of those recorded for the arctic area occur in Germany and the Tirol, 

 83.5 % of the foliaceous and 74 % of the crustaceous lichens. But most 

 remarkable to my mind is the figure 72.3 which represents the percent- 

 age of Arctic lichens found in the Tirol. With infinite care this area 

 has recently been worked through by ARNOLD more completely prob- 

 ably than any other area in the world as far as lichens are concerned. It 

 is interesting therefore and of no little importance to find that nearly 

 3/ 4 ths of the arctic lichens are recorded from the Tirol. Of the fruticu- 

 lose species 85.2 %, of the foliaceous species 78 % and of the crustaceous 

 species 68.4 % of the arctic lichens are found in the Tirol. ARNOLD re- 

 cords 1137 species for the Tirol. 



There is not as a rule very much doubt as to the naming of the 

 fruticulose or foliose lichens, but before the distribution of the crusta- 

 ceous lichens can be considered a more settled matter, it will be neces- 

 sary to work through some of the genera, like Lecidea, Lecanora, 

 Verrucaria, Aspicilia and Polyblastia monographically. A carefull 

 monograph developemental, anatomical and even histological of a 

 genus like Lecidea would be of the greatest interest botanically and 

 geographically. But it would be essential that specimens from all over 

 the world were examined. 



