6 
similarly divided. In compound fronds, the 
primary divisions are termed pinne [Plate I.-A. 
and B. p.] and when more than once divided 
the ultimate ones are known as pinnules. 
Compound fronds may be of the palmate or 
pinnate type. In the former the leaflets all 
radiate from the apex of the stipe.. Such fronds 
are saidto be one-foliate, two-foliate or binate, 
three-foliate or ternate, etc. according to the 
number of leaflets they possess. In the pinnate 
type the divisions or pinne are arranged on 
either side of the prolongation of the stipe 
termed rachis. [Plate I.-B. r.] When the 
pinne are themselves pinnate and bear pinne 
of the second order, the frond is termed. dipzn- 
nate; when these secondary pinne are again 
pinnate, the frond is tripiumnate. If the division 
extends beyond this, the frond is decompound. 
_ The Margin. The following terms are em- 
ployed to describe the edges of fronds or of 
the parts of fronds [Plate II.] :— 
(1) Entire, if the margin ‘is even. (2) 
Serrate, if it has sharp teeth and all point to 
the apex like the teeth of a saw. (3) Buserrate, if 
the teeth themselves are serrate. (4) Serrulate, if 
the teeth are minute. (5) Spindlose-serrate, if the 
teeth are. spiny. (6).Crenate, if the teeth are 
