Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Cocconeis rugosa

Sovereign 1958

Cocconeis Rugosa Guide
Credit: Pat Kociolek
  1. Valves broadly elliptic
  2. Narrow, irregular hyaline lines present

Valves are broadly elliptic. The entire margin of the raphe valve is bordered by a hyaline rim. Striae are interrupted at the poles by narrow, irregular hyaline lines on both sides of the axial area.