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Guide to Pinnularia obscura

Krasske 1932

Pinnularia obscura guide
  1. Valves linear-lanceolate
  2. Apices cuneiform
  3. Striae radiate in central valve
  4. Central area with fascia

Valves are linear-lanceolate, with cuneiform apices. Striae radiate in the center. The central area is a wide fascia.