PLATE 24 

 FIG. PAGE 



NAVICULA 



1 Navicula maculata (Bail.) Cl 90 



2 Navicula practexta Ehr 92 



3 Navicula latissima Greg 90 



4 Navicula irrorata Crev 93 



5 Navicula latissima var. elongata (Pant.) Cl. . . 91 



6 Navicula fuchsii Pant 91 



