18 



Epithemia argus Eh. 

 Epthemia zebra Eh. 

 Fragilaria mutabilis Grun. 

 Fragilaria virescens Ralfs. 

 Gomphonema acuminatum Eh. 

 Gomphonema abbreviation Ag. 

 Gomphonema intricatum Ktz. 

 Gomphonema olivaceum Eh. 

 Gomphonema parvulum Ktz. 

 Hantzschia ainphioxys Gruii. 

 Namcula Brebissonii Ktz. 

 Navicula cincta Eh. 

 Namcula cincta var. Heu fieri Grim. 

 Navicula cryptocephala Ktz. 

 Navicula mutica Ktz. 

 Navicula pumila Grun. 

 Navicula Reinhardtii Grun. 

 Navicula sphaerophora Ktz. 

 Navicula vindis Ktz. 

 Nitzschia Heufieriana Grun. 

 Nitzschia linear is W. Sm. 

 Nitzschia palea W. Sm. 

 Nitzschia recta Hantz. 

 Nitzschia stagnarum Rah. 

 Nitzschia thermalis Grun. 

 Rhoicosphenia curvata Grun. 

 Rhopalodia gibba 0. Miill. 

 Rhopalodia gibberula 0. Miill. 



Stauroneis dilatata W. Sm. 



Surirella ovalis Breb. 



Surirella ovata Ktz. 



Surirella patella Eh. 



Vanheurckia vulgar is Y. Heurck. 



VanheurcJtia vulgaris var. lacustris M. Per. 



