TERMINOLOGY. ~ - 4.5 
Each of these parts is, in accurate description, to 
e e . ~ (pm i 
be considered as a single leaf, im respect of suriaces 
<, EAS = nik Q, 
margin, apex, base*, Wc. 
G 24. 
To leaves belongs likewise the term rRoNnD, 
(frons), which is peculiar to the palms, ferns and 
lichens. Ifis defined like the leaves, fig. 3, 1). 
But the following terms ave likewise applicable 
to lichens, though not to leaves. 
1. Powdery, (pulverulenta), which consists of a 
quantity of fine dust or powder. 
Crustaceous, ee ustacea), which looks like a 
leaf, but consists of small crusts inne upeh one 
another. ! 
8. Star-like, (stellata), which spreads from the 
centre equally to all sides, fig. 3. 
4, Leathery, (coricea), which is of a firm tough 
substance, fig. 226. 
5. Thread-like, ( filamentosa), which i 
of fine threads. 
In the palms two kinds of fronds are distinguisl- 
ed. 
1. Fan-like, ( flabelliformis); this is more or less 
of a circular form; and from the point to the base 
2 
5 
g 
‘s 
* Ina simply pinnated leaf each leafet ts called prnnula, 
or sometimes fohofum; and only in doubly pinnated leaves 
do we observe the differences marked above in Nos. 4 and s. 
Linneeus, in some species of the genus Mimosa which have 
doubly pinnated leaves, calls each simply pinnated leaf of 
a doubly pinnated one, pina partialis, and each léafet, prnna 
propria, or simply pinna. 
het @ 
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