Lyon: THE PTERIDOPHYTES OF MINNESOTA. 255 



Dicksonia punctilobula (Micnx.) A. GRAY, Man. 628. 



1848. 



Reported from Minnesota by Upham. Its occurrence how- 

 ever must be considered doubtful. 

 Herb. : Not represented. 



Family SALVINIACE^. 



Salvinia natans (L.) HOFFM. Deutsch. Fl. 2: i. 1795. Sal- 

 vinia. 



Rare. 



Herb. : Sheldon, Cuzner, Minneapolis. 



Azolla caroliniana WILLD. Sp. PI. 5: 541. 1810. Carolina 

 azolla. 



Infrequent. In the sloughs of the Mississippi river below 

 Lake Pepin. 



Herb.: Holzinger, Winona; Lyon, Jefferson, Houston 

 county. 



