Pinnularia Rabenhorstii Guide
Credit: Loren Bahls
  1. Valves linear
  2. Apices bluntly rounded
  3. Proximal raphe ends deflected unilaterally

Pinnularia rabenhorstii has linear valves with bluntly rounded apices. The proximal raphe ends are deflected unilaterally. Valve width ranges from 12 to 18 µm. Striae number 4-5 in 10 µm.