PLANT ORGANS AND ORGANISMS 
IO9 
U 
Fig. 48. — Part of a cross-section through branch of Cytisus laburnum. (The 
branch was cut from the tree at the end of October.) Frbm A to £ the last 
annual ring of wood; from A to £ the spring growth with large tracheal tubes 
( T , T, T)\ 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.) 
