Cyclotella Gamma Guide
Credit: Loren Bahls
  1. Striae uniseriate nearest central area
  2. Areolae closest to central area large
  3. Valves transversely undulate
  4. Two shadow lines present

Valves have a transversely undulate central area. One shadow line is positioned near the valve margin and the other is about two-thirds of the distance to the central area. Striae are multiseriate near the valve margin and become uniseriate near the central area, where they are composed of large individual areolae that are easily resolved in LM.