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Guide to Planothidium sheathii

Stancheva 2019

Planothidium Sheathii Guide
  1. Apices obtusely rounded
  2. Rapheless valve with narrow lanceolate axial area, slightly expanded in the middle
  3. Hood flares at valve margin

Apices are obtusely rounded. The rapheless valve has a narrow lanceolate axial area, slightly expanded in the middle. Rapheless valve has a prominent cavum. The broad hood flares at the valve margin.