PRINCIPAL GROUPS OF PLANTS. 



Single 

 polyhedron. 



Net developing 

 inside of polyliedro 



OEDOGONIUM. 



Three stages in sexual reproduction. 



HYDRODICTYOX 



ULVA 



Mature Colony Diameter 2 mm. 



A. Egg cell, before fertilization. 



B. Oospore. 



C. Daughter colony 



VOL VOX 



FIG. II. Forms of Chlorophyceas or Green Algae. All adapted from Engler and 

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



