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Guide to Tryblionella plana var. fennica

(Hust.) Simola 1998

Tryblionella plana fennica guide
  1. Valves long, linear
  2. Median area wide, with depressions
  3. Striae on raphe side longer
  4. 3-7 striae joined in groups, separated by fibulae

Valves are long and linear, with a small constriction in the middle of the raphe side. Striae are interrupted by a wide median area. The external surface of the median area is covered by irregularly shaped depressions. Striae are longer on the raphe side. Groups of 3-7 striae are separated by fibulae.