328 HETEROMORPHY. 
In some varieties of Codiewm variegatum the leaves 
resemble those of Nepenthes, as the basal portion is 
broad, and terminates in a projecting midrib destitute 
of cellular covering, and this again terminates in a 
small pouch or pitcher. Somewhat similar varia- 
tions may be found in ferns, especially Scolopendrium 
vulgare. 
Instead of the pouch there is formed sometimes in 
the plant last mentioned a supplementary four-lobed 
lamina, the four lobes being in two different planes, 
and diverging from the midrib, so that the section 
would resemble }<, the poimt of intersection of the 
x representing the position of the midrib. This four- 
winged lamina is thus very similar to the four-winged 
filaments described and figured at p. 289, and to the 
leaf-like anther of Jatropha described by M. Miiller, 
p. 295. 
Cornute leaves (Molia cornuta).—The condition to 
which this term applies is that in which the midrib, 
after running for a certain distance, generally nearly 
to the point of the leaf, suddenly projects, often in a 
plane different from that of the leaf, and thus forms a 
small spine-like out-growth. Should this happen to be 
terminated by a second laminar portion, an interrupted 
leaf would be formed. In Scolopendrium vulgare and 
other ferns this condition has been noticed, as also 
in some of the varieties of Codiewin varieqatum already 
referred to. 
Flattening.—'T'here are some plants whose stem or 
branches, instead of assuming the ordinary cylindrical 
form, are compressed or flattened; such are some species 
of Hpiphyllum, Coccoloba, Bauhinia, &c. The same 
thing occurs in the leaf-like branches of Ruscus, the 
flower-stalks of Xylophylla, Phyllanthus, Pterisanthes. 
Martins proposes to apply the word ‘cladodium’ to such 
expansions, just as the term phyllodium is applied to 
the similar dilatation of the leaf-stalks. If we exclude 
