PLATE XVIII. 



Figures magnifled 500 diameters. 



Page. 

 Pig. 1. CosMAKiUM Ralfsii, . . ... 75 



Figs. 2-4. CosMARiuJi PACHYDEBMUJi ; tliree forms, 75 



Fig. 5. CosjtARiUM De Baeyi. (Compare Plate XLV, fig. 12), 62 



Figs. 6-9. CosMABiuM CucuMrs, four sizes, 62 



Fig. 10. CosMAEltJM LAEVE, a varieiy. (Compare Plate XLIII, flg. 14), 70a 



Figs. 11, 12. CosMARiTJM PSKUDOPYEAMIDAT0M. (Compare Plate XIX, figs. 



.5,6), . . 75 



Fig. 13. " " zygospore, and husks of cells, 75 



Figs. 14, 15. CosMARiOM GRANATDM, Var. elongatum, for typical form See 



