Abstract
Results of light and scanning electron microscopy investigations of valves of two freshwater achnanthoid diatoms are provided. Based on the structure of external terminal raphe endings, represented by simple pores, and cocconeoid habitus Achnanthes joursacensis Hérib. is transferred to the genus Platessa. Achnanthes rostellata A. Cleve is transferred to the genus Lemnicola due to presence of stauros on raphid valve and external terminal raphe fissures curved in opposite directions.
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