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Guide to Planothidium lanceolatoides

(Sovereign) Lange-Bert. 1999

Planothidium Lanceolatoide Guide
  1. Apices apiculate
  2. Valves 9-13 μm wide
  3. Rapheless valve with cavum
  4. Raphe valve with rectangular central area

Valves are lanceolate, with apiculate apices. Width ranges from 9-13 µm. The rapheless valve has a distinct cavum. The raphe valve has a nearly rectangular central area.