Gomphonema Johnsonii Guide
Credit: Loren Bahls
  1. Valves lanceolate
  2. Apices narrow, subapiculate
  3. Striae radiate
  4. Single stigma present
  5. Central area moderately large

Gomphonema johnsonii has lanceolate valves with narrow subapiculate apices. Striae are radiate and more widely spaced near the valve center. A single stigma is present at the end of the longest central stria. The central area is moderately large.