Nitzschia Fonticola Guide
Credit: Pat Kociolek
  1. Valves broadly lanceolate with parallel margins
  2. Apices rounded, knob-like
  3. Prominent gap in central fibulae

Valves broadly lanceolate with parallel margins. Valve ends with knob-like, rounded apices. Prominent gap in central fibulae (central nodule present). Striae are distinct.