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

Girdle view

 

Headpole

A small rounded projection of silica on the outer surface of the valve.


Citations

Houk, V., Klee, R. and Tanaka, H. (2014). Atlas of freshwater centric diatoms with a brief key and descriptions Part IV. Stephanodiscaceae B: Stephanodicsus, Cyclostephanos, Pliocaenicus, Hemistephanos, Stephanocostis, Mesodictyon & Spicaticribra. In: Poulícková, A. (ed.): Fottea 14 Supplement, 529 pp.