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Guide to Biremis circumtexta

(F.Meister ex Hust.) Lange-Bert. and Witkowski in Witkowski, Lange-Bert. and Metzeltin 2000

Biremis Circumtexta Guide
Credit: Marina Potapova
  1. Valves lanceolate
  2. Axial area wide, lanceolate
  3. Striae marginal
  4. Areolae visible under LM
  5. On one side of valve, a row of areolae next to raphe

Valves are lanceolate with slightly protracted apices. The axial area is wide and lanceolate. Areolae within striae are easily observed under LM. A longitudinal row of areolae is adjacent to the raphe slits on the primary valve side. A conopeum is visible as a longitudinal line crossing the striae.