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Guide to Pinnularia nobilis var. regularis

Krammer

Pinnularia nobilis regularis guide
  1. Valves large, linear
  2. Axial area slightly asymmetric about apical axis
  3. Central area asymmetric
  4. Striae coarse

Valves are linear, with slightly swollen central valve and rounded ends. The axial area is slightly asymmetric about apical axis. The central area is elliptic, asymmetric, and wider on the primary side of the valve. Striae are coarse.