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Guide to Planothidium lanceolatum

(Bréb. ex Kütz.) Lange-Bert. 1999

Planothidium Lanceolatum Guide
Credit: Marina Potapova
  1. Valves lanceolate to elliptical-lanceolate with slightly drawn-out apices
  2. Valves 4.5-8.0 μm wide
  3. Rapheless valve with asymmetrical central area containing depression

Valves are lanceolate to elliptical-lanceolate with slightly drawn-out apices, 7-24 μm long, 4.5-8.0 μm wide. The asymmetrical central area on rapheless valve contains a rimmed depression on the internal valve surface. The striae are multiseriate, radiate throughout both valves, 12-15 in 10 μm.