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Guide to Pinnularia subgibba var. undulata

Krammer 1992

Pinnularia subgibba undulata guide
  1. Apices subcapitate
  2. Margins weakly triundulate
  3. Axial area 1/3-1/2 valve width
  4. Central area with broad transverse fascia

Valves are linear, with subcapitate to capitate apices and weakly triundulate sides. The axial area is 1/3-1/3 valve width. The central area has a broad transverse fascia.