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Diatoms of the United States is now known as Diatoms of North America.
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Cruciform

Cribrum

 

Cuneate

Having the shape of a cross. Usually applied to describe the valve outline of some diatoms.


Citations

Barber, H.G. and Haworth, E.Y. (1981). Guide to the Morphology of the Diatom Frustule. Freshwater Biological Association, 112 pp.