NORTH AMERICAN USNEACEAE. 143 
Wellesley College, Wellesley, Mass.—Dr. L. W. Riddle. 
Prof. Bruce Fink’s, Miami University, Oxford, Ohio. 
Portland Society of Natural History, Portland, Me——Mr. A. H. 
Norton. 
Sprague, Boston Society of Natural History, Boston, Mass.—Mr. 
C. W. Johnson. 
Cummings, Wellesley College, Wellesley, Mass.—Dr. L. W. Riddle. 
Boston Society of Natural History, Boston, Mass.—Mr. C. W. 
Johnson. 
Dr. L. W. Riddle’s, Wellesley, Mass. 
Sullivant Moss Chapter, Washington, D. C.—Miss M. F. Miller. 
University of Maine, Orono, Me.—Dr. Mintin A. Chrysler. 
Williams College, Williamstown, Mass.—Dr. 8S. F. Clarke. 
Sheffield Scientific School, New Haven, Conn.—Dr. A. W. Evans. 
Johns Hopkins University, Baltimore, Md.—Dr. D. 8. Johnson. 
Taylor, Boston Society of Natural History, Boston, Mass.—Mr. OC, W. 
Johnson. 
Dr. H. E. Hasse’s, Sawtelle, California. 
Mr. C. C. Plitt’s, Baltimore, Md. 
Carnegie Museum, Pittsburg, Pa.—Dr. O. E. Jennings. 
Brown University, Providence, R. I—Dr. J. F. Collins. 
Canadian Geological Survey, Ottawa, Canada—Prof. John Macoun. 
Dr. A. C. Herre’s, Oakland, California. 
Cosson, Museum d’histoire naturelle, Paris, France.—Dr. E. Perrier. 
British Museum (Natural History), London, England—Dr. A. B. 
Rendle. 
Museum d’histoire naturelle, Paris, France—Dr, L. A. Mangin. 
Montagne, Museum d’histoire naturelle, Paris, France—Dr. L. A. 
Mangin. 
Royal Botanic Gardens, Kew, London, England—Col. D. Prain. . 
Linnean, Burlington House, London, England—Dr. B. Daydon 
Jackson. 
Dillenian, Botanic Gardens, Oxford, England—Dr. S. H. Vines. 
Acharian (in p.), Burlington House, London, England—Dr. B. 
Daydon Jackson. 
Smith, Burlington House, London, England—Dr. B. Daydon Jackson. 
EXSICCATI. 
Under each species I am citing all examples published in 
North American exsiccati. Below is given the list of ex- 
siccati examined of both North America and European dis- 
tribution : 
Canadian Lichens, prepared by John Macoun, 18— 
