GENERA LICHENUM: 
AN 
ARRANGEMENT 
OF 
THE NORTH AMERICAN 
LICHENS, 
BY 
EDWARD’ TUCKERMAN, M.A., 
PROFESSOR OF BOTANY IN AMHERST COLLEGE 5} MEMBER OF THE NATIONAL ACADEMY OF SCIENCES, OF THE 
IMPERIAL LEOP. CAROL. GERMAN ACADEMY OF NATURALISTS, AND OF THE AMERICAN ACADEMY 
OF ARTS AND SCIENCES 5 CORRESPONDING MEMBER OF THE ROYAL SOCIETY OF SCIENCES 
AT UPSAL, OF TIE BOSTON SOCIETY OF NATURAL HISTORY, OF THE PHILADEL- 
PHIA ACADEMY OF NATURAL SCIENCES, OF THE ROYAL BOTANICAL SOCIETY 
OF RATISBON, FOREIGN MEMBER OF THE BOTANICAL SOCIETY 
OF EDINBURGH, ETC. 
AMHERST : 
EDWIN NELSON. 
1872. 
® 
