Description Valves linear-lanceolate to lanceolate, with very slightly protracted, bluntly rounded apices. Striae radiate at the centre, becoming convergent at the apices, with a broadly rounded to squarish central area.
Frustulia lanceolata Agardh
1827. Flora oder Botanische Zeitung: 626
Taxonomic Comment Prior to the publication of Krammer & Lange-Bertalot (1986) this diatom was often identified as Navicula viridula Kütz. (following Hustedt 1930). Lange-Bertalot (1980) discussed the taxonomy of this species.