PRINCIPAL GROUPS OF PLANTS. 



Jingle- 

 polyhedron. 



Net developing 

 inside of polyhedron. 



OEDOGONIUNL 



Three stages in sexual reproduction. 



HYDRODICTYON 



ULVA 



Mature Colony JDiameler 2 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 

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



