EUTHALLEPHYTA EUPHYCEAE 



193 



cell, coming from the antheridium, unites with the egg cell which is contained 

 in the oogonium; the caenobium because of the cilia has a rolling motion. 

 Several species are common like V. globator and V. minor. 



Eudorina, Ehrenb. 



The caenobium is globose or subglobose rarely ellipsoid and normally con- 

 sists of 32 cells arranged within the periphery of a copious mucilaginous mass; 

 each cell contains 1 or more pyrenoids ; reproduction takes place as in Pandorina. 

 Eudorina like Pandorina produces a faintly fishy odor. 



CHARALES 



Plants of brackish or fresh water, consisting of internodes; short whorls 

 of cylindrical branches; cells nucleated; growth from an apical cell; asexual 

 reproduction by means of bulbils and vegetative threads; sexual reproduction 

 by egg-cells and spermatozoids, the latter spirally coiled in the cells of the 



Fig. 36. Bladderwrack. Fucus resiculosus. 

 Air spaces shown in light areas (/) ; concep- 

 tacles (j) containing reproductive bodies. After 

 L,uerssen. 



