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Guide to Pinnularia grunowii

Krammer 2000

Pinnularia grunowii guide
  1. Valve margin triundulate
  2. Central inflation more narrow or equal to distal inflation
  3. Fascia usually bowtie-shaped

Valves are triundulate and the central inflation is more narrow or equal to the distal inflation. The central area is usually an asymmetric bowtie-shaped fascia, but in some specimens the fascia is absent and central area is rhombic to elliptic.