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Guide to Placoneis abiskoensis

(Hust.) Lange-Bert. and Metzeltin 1996

Placoneis Abiskoensis Guide
Credit: Loren Bahls
  1. Valves linear
  2. Valve margins parallel or weakly concave
  3. Apices rostrate to subcapitate
  4. Central area transverse
  5. Striae strongly curved

Valves are relatively large and linear, 33-46 µm in length. Margins are parallel or weakly concave. The apices are rostrate to subcapitate. The central area is large and transversely rectangular. Striae are strongly curved and radiate.