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Guide to Pinnularia gibbiformis

Krammer 1992

Pinnularia gibbiformis guide
  1. Valves linear-lanceolate
  2. Apices capitat, broadly rounded
  3. Central area asymmetric

Valves are linear-lanceolate, with a swollen, asymmetric central area. Valves taper to form a central region to broadly rounded, capitate apices. Valve margins are slightly convex.