Xanthiopyxis oblonga from Nottingham, USA. Single example on the slide. Prepared by HJ Baker (likely Henry James Baker, see the Microscopist.net page here). Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 48 images stacked in Zerene (Pmax).