XV] 



LEPIDODENBRON 



119 



present ; in the lower part of the section the xylem and the 

 outgoing leaf-traces are seen in radial section and at the upper 

 end of each arm the leaf-traces alone, It, are exposed, as in 

 fig. 148, B. It is interesting to notice the large amount of 



Flo. 152. Lepidodendron vasculare. Sections of dichotomoualy branched shoot. 



A. From a section (10°5x9 cm.) in the Cambridge Botany School 

 Collection. 



B. From a section (8 cm. long) in the Cambridge Collection. 



phelloderm which has been produced in the fork of the branch, 

 at pd, where greater strength is required. 



The section represented diagrammatically in fig. 152, A, has 

 lost the outermost part of the cortex together with the leaf- 



