qQK 



B?9 



Bot. 



C,2^ 



UNITED STATES 



EXPLORING EXPEDITION. 



DURING THE YEARS 



1888, 1839, 1840, 1841, 1842. 



UNDER THE COMMAND OF 



CHARLES WILKES, U.S.N. 

 VOL. XVI. 



BOTANY. 



C R Y P T O G A M I A. 



F I L I C E S, 



INCLUDING LYCOPODIACE^ AND HYDROPTEMDES. 



BY 



WILLIAM D. BRACKENR1DGE. 



WITH A FOLIO ATLAS OF FORTY-SIX PLATES. 



PHILADELPHIA: 

 PRINTED BY C. SHERMAN. 



1854. 



3 



^Tv 



