Staurophora Columbiana Guide
Credit: Loren Bahls
  1. Valves linear-lanceolate to elliptic-lanceolate
  2. Central area small

Valves are linear-lanceolate to elliptic-lanceolate, 35-54 ┬Ám long. The central area is small (except in Janus valves) and lacks a distinct transverse fascia.