PLATE XVIII. 



Figures magnified o(X) diameters. 



1'ACK. 



Fig. 1. COSMARIUM RALFSII, . . . . . .75 



Figs. 2-4. CO8MARIUM PACHYDERMUM ; three forms, ... 75 



Fig. 5. COSMARIUM DE BARYI. (Compare Plate XL V, fig. 12), . 62 



Figs. 6-9. COSMARIUM CUCUMIS, four sizes, .... 62 



Fig. 10. COSMARIUM I.AEVE, a variety. (Compare Plate XLIII, flg. 14), 70a 

 Figs. 11, 12. COSMARIUM PSEUDOPYRAMIDATUM. (Compare Plate XIX, figs. 



5,6), . . .75 



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



Figs. 14, 15. OOSMARIUM GRANATUM, Var. elonstatum, for typical form See 



Plate LXI, fig. 13, . .64 



" 16, 17. COSMARIUM MONILIFORME, two forms, ... 64 



Fig. 18. " " after division, new semi-cells en- 



larged, . , .64 



" 19. " " . zygospore, ... 64 



" 20. COSMARIUM GLOBOSUM; a variety; See typical form, Plate 



LX, figs. 14-17, . 65 



' 21. COSMARIUM BIOCULATUM, . . .66 



" 22. . " " zygospore, . 66 







" 23. COSMARIUM TUMIIUJM, . . 67 



