A TEXT-BOOK 



OF 



GENERAL LICHENOLOGY, 



WITH DESCRIPTIONS AND FIGURES OF THE GENERA 



OCCURRING IN THE 

 NORTHEASTERN UNITED STATES. 



BY 



ALBERT SCHNEIDER, M.S., M. D., 



Felloiv in Botany, Columbia University, 1894-1896. 



BINGHAMTON, N. Y. 



WILLARD N. CLUTE & COMPANY. 



1897. 



