KEY TO THE DIAGRAM. 
A to C. —The Frond. 
A to B. —Stipes. 
D.—The Primary Rachis (the branches are tbe 
secondary Rachis. 
E. E. —Pinn^:. 
F. F. —Pinnules. 
G. G. —Scales. 
H. —Rhizome, with the true roots. 
I. —Caudex, with the true roots. 
K. —Radicles, or true roots. 
L. —Venation. —The arrangement of the veins whicn 
intersect the Pinnules. 
Fructification. —That which describes the nature and 
arrangements of the parts containing the seed¬ 
like spores. The several parts are named on 
the Plate. 
