234 WISCONSIN PHYTOPLANETON 



PLATE 49. 



Page 



Figs. 1-2. Pediastrum tetras var. tetraodon (x 1000) 174 



Fig. 3. Eaustropsis RicJiteri (x 1000) 175 



Figs. 4-7. Characium stipitatum (x 1000) 176 



Figs. 8-15. Characium curvatum (x 1000) 176 



Figs. 16-19. Characium cylindricum (Fig. 16, x 400; figs. 17-19, x 



1000) 177 



Figs. 20-24. Characium gracilipes (x 1000) 178 



Figs. 25-29. Characium limneticum (x 1000) 177 



