BRYOLOGIST 



VOL. XX, PLATE XX 



Explanation of Plate XX 

 (Photographed natural size from specimens in the writer's herbarium) 

 Fig. I. Parmeliopsis placorodia (Ach.) Nyl. 

 Fig. 2. Parmeliopsis aleiirites (Ach.) Nyl. 

 Fig. 3. Parmeliopsis aleurites var. diffusa (Ach.) Riddle. 

 Fig. 4. Parmeliopsis ambigua (Wulf.) Nyl. 

 Fig. 5. Parmeliopsis diffusa (Weber) Riddle. 



