MANACA 



FIG. 269. Manaca: A, transverse section of root: K, thin-walled cork which 

 arises in the epidermal layer; Ct, cortex consisting mostly of starch-bearing 

 parenchyma, and cells containing either rosette aggregates of calcium oxalate 

 or a yellowish-brown amorphous content; the larger cells of which are 

 mostly spheroidal in shape and usually lined with a thin layer of protoplasm; 

 L, small strands of leptome; W, wood fibers; M, medullary rays consisting 

 mostly of rectangular cells, having thick, porous walls; An, cells marking 

 the rings of growth between the spring and fall wood as also of the cambium, 

 usually filled with a yellowish-brown, amorphous substance; St, stone cells, 

 usually developed between the wood fibers and medullary rays. B, longi- 

 tudinal section showing tracheae having bordered pores (Tb); parenchyma 



