Nitzschia Microcephala Guide
Credit: Pat Kociolek
  1. Valves linear
  2. Apices protracted
  3. Length 10-15 ┬Ám
  4. Striae difficult to resolve

Valves are linear with margins straight, or slightly concave. Apices are protracted, narrow and narrowly rounded. Striae are not easily resolvable.