The Inner Structure of the Plantlet. 53 



bium cells. In plants having more than one cotyledon, 

 the cambium line is usually readily discerned in cross- 

 sections of the stem though it is rather more distinct 

 and the bark is more readily separable in woody than in 

 herbaceous* stems. In the latter, the part within the 



GU at 



e - 



;C W -V 



FIG. 22. Showing transverse section of corner of a bean stem (Vicia 

 faba). C cambium layer; e epidermis; Cu cuticle; St stoma. The dark, 

 oval-shaped spots, extending both sides of the cambium layer are the vas- 

 cular bundles; W wood cells of the vascular bundles. Moderately mag- 

 nified. (After Potter). 



cambium line corresponds to the wood of woody stems, 

 and that outside of it corresponds to the bark. 



70. Portions of Cambium from different plants may 

 Unite by Growth. If a section of cambium from one part 

 of a plant is closely applied to the cambium of another 

 part of the same plant or of another closely -related plant, 



* Herbaceous stems are those that do not have the hard, firm texture 

 of wood, as of the potato, rhubarb etc. 



