Lithodesmium californicum from Moreno, California. Single example on the slide, mounted at and angle. Fossil marine, mounted in Hyrax. Prepared by Flatters and Garnett 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. 97 images stacked in Zerene (Pmax). L. californicum is shown in Schmidt’s Atlas, Plate 159, Figure 11.