Navicula Libonensis Guide
Credit: Marina Potapova
  1. Ends rounded or very slightly protracted
  2. Proximal raphe ends straight
  3. Striae radiate at center, becoming convergent at apices
  4. Areolae visible in LM

Valves are lanceolate with rounded or very slightly drawn-out ends. The proximal raphe ends are straight and slightly expanded. The central area is transversely elliptical or irregular-rectangular, often slightly asymmetric. The lineolate striae are radiate, becoming convergent at the valve apices, 12-13 in 10 µm. The areolae are easily observed under LM and number 28-32 in 10 µm.