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Guide to Frustulia amphipleuroides

(Grunow) A.Cleve 1934

Frustulia Amphipleuroides Guide
Credit: Carrie Graeff
  1. Robust, slightly curved porte-crayon
  2. Central nodule elongate
  3. Isolated poroids may be present
  4. Longitudinal ribs slightly curved

The porte-crayon is robust and slightly curved. The central nodule is elongate, especially in larger specimens. Isolated poroids are often present in the central area and near the distal raphe ends. The longitudinal ribs and raphe are slightly curved.