PLATE LVI. 



Figures magnified 500 dianielers. 



I'AI.E. 



Figs. 1-3. Stadbastrum aculbatum, in three aspects, . . 153 



Fig. 4. Staubastrum telifeeum, normal size, 154 



" 5, 6. Staubastedm Brebissonii, . 154 



" 7, S. StAURASTKOM CERBERUS, . 15(> 



" 9, 10. Staurastbum tridentiferum, 156 



" 11-13. Staubastbu.m cbuciatdm, . 156 



" 14-16. Staurastedm Hystrix, . . 156 

 '' 17,18. Staurastbum Ravenelii. (Compare Plate LXII I, figs. 7,8), 157 



Fig. 19. Staurastbum hirsutum, . 155 



'■ 20. " " dividing, 155 

 " 21. "■ ' zyffosporewitii empty cell.s attached, 155 



Figs. 22, 23. .Staurastbum sociatum, 155 



" 24, 2-5. StALBASTRUM CONTROVERSUM, . 157 



" 26, 27. Staurastrum setigebum. 154 



Fig. 28. STAtjBASTEUM VESTiTUM, zygospore with remains of cells, . 151 



Figs. 29, 30. " ' large form, front and end views, 151 



" 31, 32. Staurastrum echinatum, front and end views, 154 



" 33, 34. Staurastrum Saxonicum, front and end views, 154 



" 35, 36. Staurastrum pectbn, front and end views, . .155 



