Pinnularia Nodosa Percapitata Guide
Credit: Loren Bahls
  1. Valve margins triundulate
  2. Apices capitate
  3. Valve surface mottled

Pinnularia nodosa var. percapitata has linear valves with triundulate margins and distinctly capitate apices. The valve face is mottled along axial and central areas. Valve width is from 7.7 to 10.6 ┬Ám.