Diatoms of North AmericaDiatoms of North America
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Guide to Pinnularia lacunicola

Patrick and Freese 1961

Pinnularia lacunicula guide
  1. Valves linear-elliptic
  2. Apices slightly protracted
  3. Central striae strongly radiate
  4. Central fascia bow-tie shaped

Valves are linear-elliptic, with slightly protracted and obtusely rounded apices. The axial area is narrow, widening into bow-tie shaped central fascia. Central striae are strongly radiate.