Gomphonema Mehleri Guide
Credit: Ian Bishop
  1. Valve lanceolate-clavate
  2. Striae coarsely punctate
  3. Axial area parallel, except at apices
  4. Sigma in line with stria

Valves are lanceolate to lanceolate-clavate. Striae are coarsely punctate. The axial area is nearly parallel, except at the apices where it tapers. A stigma is present, in line with a stria.