106 THE MOLECULAR ARCHITECTURE OF PLANT CELL WALLS 



3111 



Fig. 38. Diagram of a branching filament of Cladophora pwUfera to show the run of 



striations (and therefore of cellulose chains). One set of chains, or both, are omitted 



only in those regions where opaque cell contents made observation impossible. 



orientation. Unless, in fact, there is some very considerable difference 

 in wall structure between mature walls and that at the very tip of the 

 terminal cell, it is difficult to see how the cell grows at all, and this 

 applies also, of course, to Valonia. In general the same thing is true for 



