Fragilariforma Marylandica Guide
Credit: Ian Bishop
  1. Valves linear to lanceolate
  2. Apices strongly capitate
  3. Striae unevenly spaced
  4. Single rimoportula at apex

Valves are linear, becoming lanceolate in smaller specimens. Apices are protracted and strongly capitate. A single rimportula is present at one apex. Striae are unevenly spaced, alternate, parallel throughout most of the valve.