Cyclotella Rossii Guide
Credit: Laurel Stratton
  1. Valve face flat
  2. Ornamentation in central area variable in size and arrangement
  3. Striae uniformly-spaced at valve margin

Valves are flat, with colliculate face and regularly-spaced, thin marginal striae. Ornamentation in the central area is variable in size and arrangement (note that areolae are absent from the central area). Striae are uniformly-spaced at the valve margin