Diatoms of North AmericaDiatoms of North America
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Guide to Fragilaria pennsylvanica

E.Morales 2003

Fragilaria Pennsylvanica Guide
Credit: Gina LaLiberte
  1. Valves small, nearly fusifrom
  2. Axial area broadly lanceolate
  3. Central area variable

Valves are small and nearly fusiform in shape. The axial area is broadly lanceolate, that is, striae are short and marginal. The central area is variable and may have shortened striae on one side and striae absent on the other, or striae absent on both margins.