MetapJiyta Ranunculus. 



iSi 



arrangement is found in the cork cambium, a layer of grow- 

 ing cells lying outside the bast. This layer is capable of 

 growth in two directions outwards and inwards. Outwards 



FIG. Q5. DICOTYLEDONOUS FIBRO-VASCULAR STRAND. (Sachs.) 



V 



l>, hard bast ; c, fascicular cambium ; c b, interfascicular cambium ;y, sieve-tubes 

 in soft bast ; m, fundamental tissue ; g, dotted ducts ; t, pitted vessels. 



it forms a layer of periderm, or cork, the cells of which are 

 dead and filled with air, and have their walls rendered almost 

 impermeable to water ; and inwards a layer of phelloderm, 



