Diatoms of North AmericaDiatoms of North America
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Guide to Fragilariforma constricta

(Ehrenb.) D.M.Williams and Round 1988

Fragilariforma Constricta Guide
  1. Valves narrow-lanceolate and bi-undulate
  2. Apices rostrate, bluntly rounded
  3. Marginal spines present

Valves are narrow-lanceolate, with a central constriction. Apices are attenuate, rostrate to capitate, with bluntly rounded apices. Spines are present between the striae at valve margin.