Diatoms of North AmericaDiatoms of North America
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Guide to Aulacoseira pseudoamericana

(Camburn) Siver and Kling 1997

Aulacoseira pseudoamericana guide
  1. Mantle unornamented
  2. Valve face with 0-3 marginal rows of areolae
  3. Spines, long, spatulate or apiculate
  4. Sulcus constricted

This species has a hyaline mantle and long, robust spatulate or apiculate spines. The sulcus may appear constricted in LM, giving the frustule a bow-tie like shape. The valve face may be unornamented, or may have up to 3 rows of small, scattered areolae.