VIBURNUM 



651 



FIG. 288. Viburnum Opulus: A, transverse section of the bark; K, cork; C, 

 cells of the primary cortex; F, bast fibers; Br, separation of the cells, forming 

 a layering in the bark; Ca, rosette aggregates of calcium oxalate; S, starch 

 grains; P, parenchyma; L, small groups of sieve cells; M, medullary rays, 

 showing starch grains in some of the cells. B, longitudinal section showing 

 2 bast fibers and the surrounding parenchyma. C, tangential section showing 

 the group of medullary rays (A/). Drawing by Haase. 



