Two examples of Pinnularia chariessa var. inflata from Warri, South Nigeria. Severe yellowing of the mountant. I brought them closer together to reduce the amount of empty space in the image. No makers name, but I think this is by JA Long. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 24 images stacked in Zerene (Pmax).
Pinnularia chariessa var. inflata F. W. Mills, 1932. Original description: Mills, F.W. (1932). Some Diatoms from Warri, South Nigeria. Journal of the Royal Microscopical Society, series 3, 52: 383-394, pl. 1-4. Page 391, Plate 2, Figures 38,39.