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Guide to Pinnularia birnirkiana

Patrick and Freese 1961

Pinnularia birnirkiana guide
  1. Central area large, bow-tie shaped
  2. Central striae radiate
  3. Ends variable - rostrate to capitate

Valves are linear-lanceolate, narrowing toward the ends. The central area is large and bow-tie shaped. The valve apices are variable and may be rostrate to capitate.

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