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Guide to Fragilaria tenera

(W.Sm.) Lange-Bert. 1980

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.