PRINCIPAL GROUPS OF PLANTS. 



OEDOGONIUM. 



Single Net developing 



polyhedron. inside of polyhedroi 



Three stages in sexual reproduction. 



HYDRODICTYON 



Mature Colony Diameter 1 mm. 



A. Egg cell, before fertilization. 



B. Oospore. 



C. Daughter colony 



ULVA 



FIG. ii. Forms of Chlorophyceae or Green Algae. All adapted tr^. '' 

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



and 



