Diatoms of North AmericaDiatoms of North America
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Guide to Planothidium rostratoholarcticum

Lange-Bert. and Bak 2014

Planothidium Rostratoholarcticum Guide
  1. Valves linear-elliptic, with subrostrate apices
  2. Valves 4.9-5.5 μm wide
  3. Rapheless valve with a cavum

Valves are linear-elliptic, with subrostrate apices. The rapheless valve has a linear-lanceolate axial area and an asymmetric central area. A cavum is also present.