224 WISCONSIN PHYTOPLA.NKTON 



PLATE 39. 



Page 



Figs. 1-3. Scenedesmus arcuatus var. platydisca (x 1000) 154 



Figs. 4-6. Scenedesmus acutiformis (x 1000) 154 



Figs. 7-10. Scenedesmus armatus (x 1000) 154 



Fig. 11. Scenedesmus armatus var. major (x 1000) 155 



Figs. 12-14. Scenedesmus brasiliensis (x 1000) 155 



Figs. 15-16. Scenedesmus hystrix (x 1000) 155 



Figs. 17-19. Scenedesmus denticulatus (x 1000) 155 



Figs. 20-22. Scenedesmus longus (x 1000) 156 



Figs. 23-25. Scenedesmus al)undans (x 1000) 157 



Figs. 26-27. Scenedesmus abundans var. longicauda (x 1000) 157 



