Pinnularia lobata from Oamaru, New Zealand. Could be from Forrester’s Hill based on the F.H. 91 on the slide. Single example on the slide. This is an example of a misnamed slide – the slide says Pinnularia excellens which is incorrect. Mounted in Naphrax and dated September 1967. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo NA 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 14 images stacked in Zerene (Pmax).