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Guide to Gomphonema mexicanum

Grunow in Van Heurck 1880

Gomphonema Mexicanum Guide
Credit: Pat Kociolek
  1. Valves elliptic-clavate
  2. Headpole slightly produced, broadly rostrate
  3. Axial area straight
  4. Stigmoid offset

Valves are elliptic-clavate. The headpole is slightly produced and broadly rostrate, while the footpole is rounded. The internal stigmoidal opening is offset from the external opening. Striae are punctate, parallel to radiate and strongly radiate at the footpole. Septa and pseudosepta are present at the poles.