SMITHSONIAN INSTITUTION 
UNITED STATES NATIONAL MUSEUM 
CONTRIBUTIONS 
FROM THE 
UNITED STATES NATIONAL HERBARIUM 
VotuME VIII, ParT 3 
A STUDY OF CERTAIN MEXICAN AND GUATEMALAN 
SPECIES OF POLYPODIUM 
By WILLIAM R. MAXON 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
19 0 3 
