148 



PHARMACEUTICAL BOTANY 



-A 



FIG. 75. Part of a cross-section through branch of Cytisus laburnum. (The 

 branch was cut from the tree at the end of October.) From A to the last 

 annual ring of wood; from A to B the spring growth with large tracheal tubes 

 (T, T, D; between B and C and D and D are wood-fibers; between C and D and 

 D and E, wood parenchyma; from E to F, cambium; F to G, phloem portion; G to 

 H, cortical parenchyma; M, medullary ray. Below A the last wood-fibers and 

 wood parenchyma formed the previous year. (From Sayre after Haberlandt.) 



