EXPLANATION OF TERMS 



tered fronds. The fronds of the Brake are more 

 or less solitary, rising from distinct and somewhat 

 distant portions of the rootstock. The Botrychiums 

 usually give birth to a single frond each season, the 

 base of the stalk containing the bud for the suc- 

 ceeding year. 



FIG. i 



FIG. 3 



A frond is simple when it consists of an undivided 

 leaf such as that of the Hart's Tongue or of the 

 Walking Leaf (Fig. i). 



A frond is pinnatifid when cut so as to form 

 lobes extending half-way or more to the midvein 

 (Fig. 2). 



