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Guide to Gomphonema acuminatum

Ehrenb. 1832

Gomphonema Acuminatum Guide
Credit: Pat Kociolek
  1. Valves clavate
  2. Tumid at the center
  3. Two marginal constrictions
  4. Headpole broad, becomes apiculate

Valves clavate, tumid at the center with two constrictions along the margin; at the headpole the valve is broad and then becomes apiculate at the headpole, the footpole is rounded. The axial area is narrow, straight, until broadening to form an irregular central area. The raphe is lateral and undulate.