310 
THE FERN PARADISE. 
Adders-tongue, and there is even a closer affinity 
. between the two species of the last-named Fern; 
but we have not considered it necessary to place 
these three species amongst the 4 Fern groups’ 
which we shall now proceed to describe. We 
propose to follow pretty closely the order observed 
by the botanists—arranging the thirty-two Ferns 
which we have yet to speak of in seven groups. 
These we shall call the Polypodies, the Shield 
Ferns, the Bladder Ferns, the Woodsias, the 
Buckler Ferns, the Spleenworts, and the Filmy 
Ferns. 
