Navicula Peregrina R Guide
Credit: Loren Bahls
  1. Valves large, lanceolate
  2. Striae widely spaced in the central area
  3. Areolae coarse
  4. Proximal raphe ends expanded

Valves are large and lanceolate. Striae are more widely spaced striae in the central area than elsewhere. The areolae are coarse. The proximal raphe ends are expanded and deflected to the primary side.