Diatoms of North AmericaDiatoms of North America
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Guide to Orthoseira roeseana

(Rabenh.) Pfitzer 1871

Orthoseira Roeseana Guide
  1. Cells heavily silicified
  2. Marginal spines conical or flattened
  3. Carinoportulae 2-5
  4. Cells joined in filaments

Cells are heavily silicified, large and possess deep mantles. They are adjoined face-to-face by regularly spaced marginal spines. On the valve face, a small central area contains 2-5 carinoportulae.