846 



MR JOHN M'LEAN THOMPSON ON 



The division of the three bundles constituting the leaf-trace at the top of the 

 rachis, and the separation and nature of the three pinna-traces alone need be 

 described, for the ground tissue, epidermis, and hairs in this transitional region are 



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identical with those of the rachis. It should be noted that the following account is 

 based on a leaf in which the left pinna departed at a lower level than the right- 

 hand pinna. 



The very summit of the rachis is distended, and antero-posteriorly flattened, and 

 the abaxial bundle — which was the smallest of the group of three in the region 

 immediately below — is enlarged and elongated laterally (figs. 3 and 4, and text-figs. 



