Diatoms of North AmericaDiatoms of North America
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Guide to Fragilaria amphicephaloides

Lange-Bert. in Hoffman et al. 2011

Fragilaria Amphicephaloides Guide
  1. Valves narrow
  2. Ends attenuate, capitate
  3. Striae alternate
  4. Central area hyaline

Valves are narrow, with attenuate, capitate apices. Striae are coarse, distinctly alternate and parallel throughout. The central area is typically hyaline, although some specimens may possess ghost striae.