242 



MACROMOLECULAR COMPLEXES 



Fig. 9. Model of wall structure in a vesicle of Valonia ventricosa. The black 

 and white tapes represent the run of the two major sets of microfibrils, one in 

 a slow left-hand spiral and the other in a steep left-hand spiral. The gray tape, 

 a fairly steep right-hand spiral, corresponds to the third orientation. One "pole" 

 lies in the center of this figure, the other lying on the far side of the model. 



of the next; and microfibrils from one lamella mav turn through 90° 

 and become part of the next lamella (Frei and Preston, 1961). This 

 seems to be clear evidence that the wall and the cytoplasm must be 

 intermixed during microfibril synthesis. Examples of these inter- 

 weavings are given in Fig. 10. 



The strongest evidence for the existence of a cellulose-protein 

 complex comes, however, from examination of the development of 

 a new cell wall over the surface of the spores of these plants, and 

 from an examination of lamellae just being deposited in adult cells 

 (Nicolai, 1957; Nicolai and Preston, 1959; Frei and Preston, 1961; 

 Preston and Kuyper, 1951; Preston et al, 1953). The first wall 

 lamella deposited around a zoospore, gamete, or zvgote carries 



