Pinnularia hartleyana var. pulchella from Warri, Southern Nigeria. Single example on the slide. Prepared by JA Long. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 18 images stacked in Zerene (Pmax).
Pinnularia hartleyana var. pulchella 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 390, Plate 2, Figures 19,20.