LEAF MOSAICS 



95 



FIG. 102. Leaf arrangement of horse-chestnut on 

 vertical shoots (top view) 



After Kerner 



leafstalks so as to bring the blades of the lower leaves out- 

 side those of the upper leaves. Examination of Figs. 102 and 

 103 will make the 

 matter clear. 



The student who 

 observes the leafage 

 of trees of different 

 kinds on the growing 

 tree itself may notice 

 how circumstances 

 modify the position 

 of the leaves. Maple 

 leaves, for example, 

 on the ends of the 

 branches are ar- 

 ranged much like 

 those of the horse- 

 chestnut, but they 

 are found to be arranged more nearly flatwise along the inner 

 portions of the branches, that is, the portions nearer the tree. 



Figs. 104 and 105 

 show the remarkable 

 difference in arrange- 

 ment in different 

 branches of the 

 Deutzia, and equally 

 interesting modifica- 

 tions may be found in 

 alternate-leaved trees, 

 such as the elm and 



FIG. 103. Leaf arrangement of horse-chestnut the cherry. 



on vertical shoots (side view) 112. Leaf mosaics. 



After Kerner J n ver y many cases 



the leaves at the end of a shoot are so arranged as to form a 

 rather symmetrical pattern, as in the horse-chestnut (Fig. 102). 



