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Guide to Caloneis bacillum

(Grunow) Cleve 1894

Caloneis Bacillum Guide
Credit: Pat Kociolek
  1. Valves linear to linear-lanceolate
  2. Fascia asymmetric

Valves linear to linear-lanceolate. Axial area linear, expanded at the central valve to form a broad transverse fascia. The fascia is typically asymmetric.