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Guide to Psammothidium alpinum

Potapova and Enache 2013

Psammothidium Alpinum Guide
Credit: Marina Potapova
  1. Valves linear-elliptic to oval
  2. Raphe straight
  3. Areolae coarse

Valves are linear-elliptic to oval. The raphe valve has a rectangular-irregular central area. The raphe is straight with drop-shaped distal ends and the terminal fissures are absent. The rapheless valve has an irregular, rounded to rhomboid central area. Areolae are coarse, round and number 25 in 10 μm.