A strew slide of Pleurosigma angulatum (with some Gyrosigma also present). Prepared by Ernst Leitz Wetzlar. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 13 images stacked in Zerene (Pmax).