•14- 



^'^ 



Plate I. On the left: upper, branch of Usnca bar bat a hij-ia x 5 show- 

 ing soredia: lower, portion of U. angulata x 5. On the right: upper, portion 

 of U. longissinia x 2; middle, of U. articula/a x 2; lower, of i'. tricJwdea 

 X 2. 



