6o 
Margaret W. Rea 
rule there were no stomata seen till about the fourth or fifth cell 
inwards from the margin. 
Normal shoot. On the under surfaces there was no regular 
marginal row till the sixth leaf from the base. In the leaves higher 
up this row was sometimes present; while on the twentieth leaf it 
was noted that there was a marginal row along one side of 
the leaf and not on the other. The stomata were arranged evenly 
on the upper surfaces of all the leaves. 
Shade shoot. On the under surfaces generally speaking, the 
stomata were more numerous. The stomata were evenly distributed 
on the upper surfaces. 
Fig. 2. (a) large, ( b) medium, and (c) small stomata, (d) hydathode, from upper 
surface of a leaf. All x 500. 
Sun shoot. On the under surfaces there was usually no 
marginal row present. The twenty-sixth leaf had an irregular 
marginal row and the top leaf had two more or less regular 
rows round the edge. Otherwise in that region the stomata were 
arranged irregularly. On the upper surfaces they were again evenly 
arranged. 
Size of stomata. The under surfaces of the “ Whole,” Normal 
and Shade shoots, showed a varying number of large, medium 
and small stomata (see fig. 2) the shade shoot having more 
medium sized pores. The medium size predominated on the 
under surfaces in the sun plant and on the upper surfaces of all 
three types. 
