Diatoms of North AmericaDiatoms of North America
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Guide to Pinnularia turgidula

(Grunow ex Cleve) Kulikovskiy, Lange-Bert. and Metzeltin 2010

Pinnulara turgidula guide
  1. Valves with strongly gibbous center
  2. Apices capitate, broadly rounded
  3. Valve surface mottled

Valves have a strongly gibbous center and broadly rounded, capitate apices. The axial area is linear, gradually widening into a lanceolate central area. The external valve surface has a mottled appearance.