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Guide to Stephanodiscus medius

Håk. 1986

Stephanodiscus Medius Guide
  1. Fascicles biseriate to triseriate (at margin)
  2. Marginal spine at every interfascicle
  3. Valve face concentrically undulate
  4. 6-10 fascicles in 10 µm

Valves with concentrically undulate valve face. Fascicles biseriate, or more commonly triseriate, at the margin. Fascicles, 6-10 in 10 µm. Each interfascicle ends with a marginal spine.