PLATE VII. 



Figures magnified 250 diameters. 



PAGE. 



Fig. 1 . CLOSTERIUM OBTUSUM, . . . . . .39 



" 2. CLOSTERTUM JUNCIDUM, .... 39 



" 3. " two cells with developed zygospore, . ,39 



Figs. 4, 5. CLOSTERIUM GRACILE, ..... 40 



Fig. 6. OLOSTERIUM MACILENTUM, . . . . .40 



" 7. CLOSTERIUM ACEROSUM, zygospore and empty cells, . 42 



" 8. CLOSTERIUM STRIOLATUM, . . . . .44 



Figs. 9, 10. CLOSTERIUM DECUSSATUM, ..... 41 



Fig. 11. CLOSTERIOM ACEROSUM, vegetative cell, . . . .42 



" 12. CLOSTERIUM NASUTUM, ..... 43 



Figs. 13, 14. CLOSTERIUM STRIGOSUM, . . . . . .44 



Fig. 15. CLOSTERIUM TURGIDUM, ..... 43 



" 16. CLOSTERIUM LINEATUM, two cells, (see Plate IX, tig. 15), . 1 " 



Figs. 17, 18. CLOSTERIUM CUCUMIS, ..... 42 



Fig. 19. CLOSTERIUM COSTATUM, . . . . . .45 



' 20. CLOSTERIUM STRIOLATUM, (compare fig. 8, and Plate VI, 



figs. 5-8), . . , .44 



Figs. 21-23. CLOSTERIUM ANOUSTATUM, and variety decussutum, . 41 



