PRINCIPAL GROUPS OF PLANTS. 



4 Zoospores 



developing from 



oospore. 



Single 

 polyhedron. 



Net developing 

 inside of polyhedron. 



OEDOGOXIUM. 



Three stages in sexual reproduction. 



HYDRODICTVON 



ULVA 



Mature Colony Diameter 1 mm. 



A. Egg cell, before fertilization. 



B. Oospore. 



C. Daughter colony 



VOLVOX 



FIG. ii. Forms of Chlorophyceae or Green Algae. All adapted from Engler and 

 Pranti except Ulva. Drawn by A. K. Lobeck. 



