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Guide to Gomphonema semiapertum

Grunow in Van Heurck 1880

Gomphonema Semiapertum Guide
Credit: Loren Bahls
  1. Valves very large, >70 µm
  2. Central area large, asymmetric
  3. Raphe strongly lateral
  4. Internal proximal raphe ends steeply deflected

Valves are large, over 70 µm in length. The central area is large and asymmetric. The raphe is strongly lateral. The internal proximal raphe ends are steeply deflected, forming barb-like ends.