Navicula Seibigiana Guide
Credit: Sarah Spaulding
  1. Striae radiate in center
  2. Striae convergent near apices
  3. Striae robust
  4. Central striae shortened

Valves are 5-6 µm wide with robust striae that number 11-12 in 10 µm. Striae are radiate in the middle, becoming abruptly convergent near the apices. The central 1 or 2 striae are shortened.