Diatoms of North AmericaDiatoms of North America
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Guide to Placoneis explanata

(Hust.) Mayama in Mayama and Kawashima 1998

Placoneis Explanata Guide
  1. Valves linear
  2. Apices rostrate
  3. Striae parallel near apices
  4. Central area variable

Valves are linear, with weakly convex margins. Apices are rostrate and bluntly rounded. Striae are radiate at the valve center, becoming more dense and parallel at the apices. The central area is bow-tie to rectangular in shape.