THE LEAF. 



197 



the cabbage-leaf, and this would seem to be a more 

 frequent phenomenon. Sometimes the stalked enation 

 may itself branch copiously and bear numerous pitchers. 



A good example has been furnished in the ivy 

 (Hedera Helix) of a pitcher arising on a lower surface 

 of the leaf ; it arises from the midrib not far from the 

 base ; it is not, as are many of those of the cabbage, a 

 symmetrically-shaped structure, but rather resembles 

 a church collection -bag, i. e. it is a leaf with a basal 



en. 



Fig. 53. — Brassica oleracea. Transverse section through region of 

 midrib at point of outgrowth of enations (en). I, midrib of leaf. 



pocket ; the inner surface of this structure is morpho- 

 logically the upper surface, the law being thus again 

 obeyed. Eichler gives beautiful illustrations of the 

 same type of structure in Michelia champaca (Mag- 

 noliacese). 



To this category belong those cases in which the 

 greater part of the leaf is constituted as a pitcher, the 

 part bearing it forming but a small fraction of the whole 

 leaf; such a leaf, e. g., was one of an uppermost pair 

 in a shoot of Lonicera conjugalis ; the ascidium, which 

 was composed of a lamina with a basal pocket towards 

 the upper surface, was borne on the lower surface of 

 the small basal saucer-shaped portion of the leaf 



