Navicula Kotschyi Guide
Credit: Ian Bishop
  1. Central valve margins parallel
  2. Apices capitate
  3. Areolae coarse
  4. Central area with marginal areolae
  5. Striae radiate, except at apices

Valves are linear with parallel central margins. The apices are distinctly capitate. Striae are radiate, becoming nearly parallel at the apices. The central area is bowtie-shaped and has marginal areolae. Areolae are coarse.