FIG. 1. I'. Rousseletii and V. capensis. Cell detail. 



A, B, Cells from the anterior pole A, side, and B, front view ; C, cell from posterior 

 pole ; D, cell as seen from above ; E, F, V. capensis E, cells in surface view 

 prior to last division, gonidium already much enlarged ; F, section through 

 inverting colony (infolding complete) showing a gonidium on the right. 

 G, H, V. Roussdetii G, cells from a young male colony in surface view ; one 

 male initial cell much enlarged, three others still small but distinguished by 

 the presence of two pyrenoids ; H, pyrenoids showing varying numbers of 

 starch slabs (stained iodine). 

 A-D x3000; E, G x 1500; F x300; H xSOOO; all approximately. 



