Guide to Gomphonema variostriatum
Credit: Ian Bishop
- Valves clavate
- Central area asymmetric
- Strong stria density gradient from mid-valve to apices
Valves clavate, with a narrowly rounded footpole. The central area is distinctly asymmetric due to a single extended middle stria, which reaches from one margin to a single isolated stigma near the apical axis. Striae greatly increase in density toward the apices.