Guide to Gomphonema turgidum
Credit: Ian Bishop
- Headpole broad, truncated
- Raphe complex, undulate
- Striae coarse, uniseriate
- Stigma present
Valves are strongly asymmetric to the transapical axis, with broad, truncated headpole. The central area is small ,with central striae of variable length. A single isolated stigma is present. Striae are coarse and uniseriate. Striae are parallel to weakly radiate, except at the footpole, where they become strongly radiate.