PLATE LIII. 



Figures magnified 500 diameters. 



Pacf. 



Fig. 1. Penium Digitus, . . . . . . .34 



Figs. 2, 3. Staurastruw brevispina, front and end view, . . 121 



4,5. Staubastrum lnconspicuum, ..... 125 



;. 7. Staubastri m i>i ru \. ..... 149 



Fig. 8. Hy.u.uihi. \ i m>i lata, . . . . .23 



FigB. 9. 1". CiiOSTKRn m strigosum, two zygospores with empt> cells at- 

 tached, .... 12 



Fig. 11. El Willi M Ml LTILOBATUM, ..... 98 



Figs. 12, 13. MICRA8TERIA8 CONFERTA . . . . .114 



" I I. 15. < I -MAIM l M EXC \\ \ I I M . . . . . 77 



Fig. 16. DocrDITJM CORONT LAT1 M, . . . .40 



" 17. I'i in \sn in m -1 Mi'i 1 \. . . . . . 152 



" 18. Pedi \m 1:1 m Sti rmii, ...... 153 



" 19. Pediastrum simplex, Var. ..... 153 



20. Pediastruw duodenabtum, ..... 153 



" 21. Pedi isn ai m i or ipatxtm, . . . . . i ; >" 



Figs. 22, 23. Pediastrum Ehrehbergii, .... 154 



Fig. 24. Pedi wstri m pi pras, . . . . . . 154 



Figs. 25, 26. Pediastrum Ehrenbergii, .... l~>4 



Fig. 27. variety, . .154 



" 28. Pediastrum lngulosi m. ..... 153 



' "J 1 .*. PeDIASTR! M BORYANOM, ..... l").'i 



>. 30, 31. Pediastrum forcipatum, ..... 15.3 



Fig. 32. Pediastruw Boryanum, ..... 153 



Figs. 33, 34. Pediastri m pertusum, ..... 154 



I'Il:. :;.">. " " Var. brachylobum . . 154 



" 36. Pediastrum MUTicuM. . . . . . . 153 



" 37, Pediastrum anqulosum, variety, .... 153 



