Aulacodiscus and Coscinodiscus diatoms from Panoche [Hills], California, USA. Mounted in Styrax and dated January 1941. Prepared by Samuel Henry Meakin. Olympus BHB microscope 450nm LED light. 20x Nikon Plan Apo 0.65. Olympus Aplanat Achromat condenser, oil immersion. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 37 images stacked in Zerene (Pmax).