DISPLACEMENT OF LEAVES. 



89 



trophy, whether that excess of development take place 

 laterally or lengthwise (see elongation). Atrophy or 

 suppression will also frequently bring about an altera- 

 tion in the position of leaves ; sometimes in such a 

 manner that the place of the suppressed organ is 

 occupied by another one. One of the most curious 

 instances of displacement of leaves arising from sup- 

 pression is that mentioned by Morren, where, in 

 Gesnera Geroltianay a large leaf apparently occupied 



Pig. 41. Ordinary arrangement of leaves in fascicles of tbree in 

 Pinus pinea and unusual arrangement of leaves of same plant in spires. 



Bull. Acad. Belg.,* t. xvii, part ii, p. 387. 



