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Guide to Psammothidium acidoclinatum

(Lange-Bert.) Lange-Bert. 1996

P Marginulatum Guide
Credit: Marina Potapova
  1. Valves elliptic-lanceolate to linear-elliptic
  2. Raphe valve with transversely elliptic central area
  3. Rapheless valve with wide rhomboid-lanceolate axial area

Valves are elliptic-lanceolate to linear-elliptic. The raphe valve has a linear axial area, which widens toward the center of the valve, and a transversely elliptic central area. The raphe is straight, without terminal fissures. The rapheless valve has a wide rhomboid-lanceolate axial area. Striae are radiate on both valves, 23-27 in 10 µm.