226 WISCONSIN PHYTOPLANETON 



PLATE 41. 



Page 



Figs. 1-2. Scenedesmus quadricauda var. maximus (x 1000) 159 



Figs. 3-7. Scenedesmus quadricauda var. Westii (x 1000) 159 



Figs. 8-11. Scenedesmus opoliensis (x 1000) 159 



Figs. 12-13. Coelastrum microporum (x 825) 160 



