PLATE XXIX. 



Figures raagnifled 500 diameters. 



Page 

 Fig. 1-3. Edastrcm VENTEicosnM, zygospore, lateral and end views of 



cell, . . . .110 



Figs. 4, 5. EuASTRUM ceassum, Var. scbobicdlatum, front and lateral 



views, 



" 6-8. EnASTEUM magnificum, front, lateral and end views, 



" 9-11. Etjastrum PDRUM, two front and one lateral view, 



" 12, 13. EuASTRDM OUNEATDM, front and lateral views. 



