The Inner Structure of the Plantlet. 



53 



biuni 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 ^\-ithin the 



Gu ^, St 



5t---... 



c— - 



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

 faba). C cambium layer; e epidermis; Cu cuticle; 8t stoma. The dark, 

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

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

 nified. (After Potter). 



cambium line corresponds to the -nood of woody stems, 

 and that outside of it corresponds to the bark. 



70. Portions of Cambium from different plants may 

 Lnite 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. 



