PLATE CXI. 



FIGS. PAGE 



1. Xantliidium cristatum Breb. Zygospore, from a 



poor figure by Reinsch, x 360 . .71 



2-4. X. cristatum var. uncinatum Breb. 2, x about 

 360 (after Ealfs) ; 3, x 500 (after Turner) ; 

 4, x 360 (after Him) . . .73 



5. X. cristatum var. Delpontei Roy & Biss. x 416 



(after Delponte) . . .74 



6-8. X. fasciculatum Ehrenb. 6,, x 400 (after Ralfs) ; 



7, x 400 ; 8, x 400 (after Nordstedt) . 75 



9. X. fasciculatum var. Oronense W. & G. S. West. 



x 520 . . . .77 



10. X. Smithii Arch. Zygospore, x 400 (after Roy 



& Bissett) . . . .61 



