Smithsonian Report. 1*^30.- Llano 



Plate 2 



4 ' 



1 . Rock tripe, u mbilicaria papulosa, with Pusi ui_t=. on its Upper Surface 

 AND Two Other Species of umbilicaria on the Rock 



This and other kinds of rock tripe, Gyrophora sp., have been used by polar 

 explorers as emergency food. 



2. EVERNIA FURFURACEA. SHOWING UPPER AND LOWER SURFACES OF THE 



THALLUS 



Mount Desert Island, Elaine. 



