Trib. — Closteriees. 



Closteriam Nitzsch. 



PeDium Breb. 



Trib. — Docidiees. 



Triploceras Bail. 





Pleurotaenium Nat 



Docidium Breb. 









Trib. - 



- Micrasteriees. 



Pleurotaeniopaia Luw. 





Euastrum Ehrenb. 



Xanthidium Ehrenb. 





Micrasterias Ag. 



Cosmarium Corda. 





Staurastrum Mey. 





Ordre. — 



DIATOMIN^ES. 





Fam. — 



Bacillariacees. 





Sous-fam. 



— Raphide"ea. 





Trib. 



— Cymbellees 



Amphora Ehrenb. 





Encyonema Kuetz. 



Cymbella Ag. 









Trib. 



— Naviculees. 



Mastogloia Thw. 

 Stigmapbora Wall. 

 Dictyoneis Cleve. 

 Stauroneis Ehrenb. 

 Pleurostauron Rabenh. 

 Navicula Bory. 

 Trachyneis Cleve. 



Gomphonema Ag. 



Achnanthes Bory. 



Libellus Cleve. 

 Van Heurckia Breb. 

 Pleurosigma Breb. 

 Scoliopleura Grun. 

 Rhoicosigma Grun. 

 Amphiprora Ehrenb. 

 Auricula Castr. 



Trib. — Gomphonemees. 



Trib. — Achnanthees. 



Trib. — Cocconeidees. 



Cocconeis Ehrenb. Orthoneis Grun. 



Sous-fam. — Pseudo-Raphide'es. 



Trib. — Eunotiees. 

 Cystopleura Breb. 

 Eunotia Ehrenb. 

 Pseudo-Eunotia Grun. 



Trib. — Synedrees. 



Synedra Ehrenb. 

 Paeudo-Synedra Leud.-Fortm. 



Trib. — Fragilariees. 



Fragilaria Lyngb. 



Trib. - 



Ardissonia De Not. 

 Thalassiothrix CI. et Grun. 



Sceptroneia Ehrenb. 

 Dimeregramma Ralfs. 



Trachyspheniees. 



Plagiogramma Grev. 



