PLATE VI. 



FIGS. PAGE 



1-3. Penium Cylindrus Khrenb. 1, after Ralfs, x 



400 ; 2 and 3, x 520 ; 3, zygospore . 84 



4-5. P. cuticulare West & (I. S. West. x 520 . 85 

 6-7. P. exiguiim West. x 400 . . 86 



8. P. ej'iguum forma major West & G. S. West. 



x 520 . .86 



9-11 .P. phymatosporum Nordst. After Nordstedt, 



x 570 . . . .91 



12-13. P. nifexceny Cleve. 12 ; x 520; 13, after Cleve, 



x 400 . . . .99 



U-lG.Netrium DiyihtN (Elirenh.) Itzii?sh. fc Rotlie. 

 14, x 520; 15, after Ralfs, x 200; 16, x 

 400 . . . . .64 



17. N. Dicjit us var. const ric turn West. x 300 . 65 



