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Guide to Muelleria gibbula

(Cleve) S.A.Spauld. and Stoermer 1997

Muelleria Gibbula Guide
Credit: Loren Bahls
  1. Valves elliptic
  2. Valves <10 µm wide
  3. Striae radiate, straight

Valves are elliptic and less than 10 µm wide. The central margin is often gibbous. Striae are radiate, especially in the center, and straight. Proximal raphe ends are unilaterally deflected. The central area is small.