Fragilaria Tenera Guide
Credit: Barry Rosen
  1. Narrow valves
  2. Capitate ends
  3. Central area lanceolate

Valves are narrow and lanceolate, with attenuated, capitate apicies. The axial area is lanceolate and a fascia may be present or absent. Striae are more narrow than costae and extend midway onto the valve mantle.