Diatoms of North AmericaDiatoms of North America
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Guide to Neidium iridis

(Ehrenb.) Cleve 1894

Neidium iridis2 guide
  1. Valves very large
  2. Valves linear-lanceolate
  3. Apices cuneate
  4. Axial area with unilateral scattered areolae

A number of other large Neidium species have been confused with this taxon. It is distinguished by the valve outline and irregular areolae on one side of the raphe.