Researches upon the epilithic diatoms flora from Cerna Valley

In this paper the diversity of epilithic diatoms flora in Cerna River is presented, from upstream to the junction with Bela Reca River (downstream of Herculane city). The identified species came from samples witch were brushed from the surface of different kinds of rocks. Then the samples were preserved and processed with specific techniques. The identification and the taxonomic classify were in accord with specialty literature.