PROCEEDINQS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES. 



Third Series. 



Botany. Vol. I, No. 7. 



The Nature of the Association of Alga 

 and Fungus in Lichens. 



BY 



George James Peirce, 



Assistant Professor of Plant-Physiology, Leland Stanford Junior University- 



With One Plate, 



Issued June s, 1899- 



SAN FRANCISCO: 



Published by the Academy. 



1899. 



