Guide to Navicula oblonga
Credit: Loren Bahls
- Large linear valves
- Terminal striae bent
- Central striae do not reach valve margin
- Proximal raphe ends simple
- Striae finely lineate
The large valves of Navicula oblonga are linear and lack protracted ends. Although terminal striae are convergent at the margins, they are bent back toward the central area and are radiate next to the axial area. Short central striae often do not reach the valve margins. Proximal raphe ends are simple and barely wider than the raphe. Striae are finely lineate and the individual areolae are difficult to distinguish.