Navicula Elsoniana Guide
Credit: Paul Hamilton
  1. Valves wide, lanceolate
  2. Central area large, asymmetric
  3. Axial area narrow
  4. Raphe filiform

Valves are broadly lanceolate with protracted, narrow apices. The large asymmetric central area is distinct. Striae are radiate at the center to convergent at the apices. The proximal raphe ends expand into a round terminal pore The distal raphe fissures are scythe-shaped.