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Diatoma elongatum Ag. 



Diatoma hiemale Heib. 



Diatoma hiemale var. ruesodon Grun. 



Diatoma tenue Ag. 



Diatoma bulgare Bory. 



Diatoma vulgave var. lineare Gnin. 



Diploneis elliptica ('levé. 



Diploneis elliptica var. grandis Cleve. 



Diploneis elliptica var. Ladogensis Grun. 



Diploneis elliptica var. minuta. 



Diploneis elliptica var minutissima. 



Diploneis elliptica var. oblongella (ovalis v. oblon.; 



Diploneis elOvptica var. ovalis (ovais). 



Diploneis hyalina Cleve. 



Diploneis interripta Cleve. 



Diploneis interrupta var. fosstlis M. Per. 



Diploneis interrupta var. major M. Per. 



Diploneis ovalis Cleve. 



Diploneis ovalis var. elongata A. Sch. 



Diploneis ovalis var. oblongella Cleve. 



Diploneis puella Cleve. 



Encyonema caespitosum Ktz. 



Encyonema gracile Rab. 



Encyonema lunula Grun. 



Encyonema paradoxum Ktz. 



Encyonema prostratum Ralfs. 



Encyonema prostratum var. major. 



Encyonema turgiolum Grun. 



Encyonema ventricosum Grun. 



Encyonema ventricosum var. minuta Grun. 



Epithemia argus Ktz. 



Epitliemia argus var. alpestris Grun. 



Epithemia argus var. longicornis Grun. 



Epithemia argus var. nceUata (ocellata). 



Epitliemia Aspeitiaxa Hérib. 



Epithemia Aspeitiaxa var. dilatata Hérib. 



Epithemia cistula Ralfs. 



Epithemia cistula var. crassa Pant. 



Epithemia Hyndmannii "W. Sm. 



Epithemia ocellata Ktz. 



Epithemia turgida Ktz. 



