A slide with three examples of Melosira sulcata var. siberica from Simbirsk, Russia. One has gone on a wander. Prepared by Watson and Sons Ltd. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 25 images stacked in Zerene (Pmax). Diatom viewed from the underside with the rim facing the coverslip.