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Guide to Gomphonema elongatum

W.Sm. 1855

Gomphonema Elongatum Guide
Credit: Pat Kociolek
  1. Headpole weakly expaned with protracted apex
  2. Central valve tumid
  3. Valves acuminate-apiculate
  4. 40-105 µm long

Valves acuminate-apiculate, with the headpole weakly expanded and protracted. The central valve is tumid. Both of the central striae are shortened, and on one side is positioned a single, isolated stigma.