LEAVES, ETC. 427 
Such cases as this hardly come under the head of mal- 
formations. But where one part only of the leaf 
is excessively developed, the other portion remaining 
in its ordinary condition, there can be no hesitation in 
ranking the phenomenon as teratological. 
Thus, Moquin says that the median nerve may be 
prolonged beyond the blade of the leaf in the form of 
a short strap or ribbon-like excrescence, while, at other 
times, the lateral parts of the leaf are subjected to 
undue development. He refers to a case cited by 
Schlotterbec’ in which each side of the leaves of a 
yellow ‘‘ violier”’ (wallflower) was dilated into a kind of 
projecting lobe on either side of the true apex of the 
leaf, thus rendering it in appearance three-lobed. M. 
Delavaud’ puts on record a case of hypertrophy in the 
leaves of the common elm, resulting in the formation 
of an additional lobe and a return to the tricostate 
type. <A leaf so-affected is stated to have presented 
the appearance of a fusion of two leaves. (See also 
Multiplication of leaves, p. 353.) 
The hypertrophied and coloured leaf of Gesnera occu- 
pying the place of the absent inflorescence has been 
previously alluded to under the head of displacement 
(p. 88). 
In some instances hypertrophy is the opposite of sup- 
pression; as in the case previously mentioned, where 
the stipule in the inflorescence of a pea, which is usually 
undeveloped and rudimentary, was developed in the 
form of a leafy cup or pitcher. 
Another instance of the development of parts usually 
suppressed, is afforded by the bud-scales of Magnolia 
jfuscata, which may sometimes be found with small but 
perfect leaves projecting from them, the leaf in this 
case being the lamina which is ordinarily abortive, 
while the scales are the representatives of the stipules. 
This condition is said by Hooker and Thomson (‘ Flora 
Indica,’ p. 73) to be constant in Magnolia Campbelli. 
1 ©“ Sched. de Monst. Plant,” in ‘ Act. Helvet.,’ t. 11, pl. u, f. 14. 
2 * Bull. Soc. Bot. France,’ vol. viii, 1861, p. 144, 
