A strew slide from Palos Verdes, California. Fossil marine material. Diatomite sample from H Jay Margolis. Diatom sample from the collection of Colonel William D Fleming, US Army, MD FRMS. Mounted in Pleurax and dated May 2026. Slide prepared by Michel Haak. Olympus BHB microscope using 450nm LED light. As well as the wider field of the strew, I selected a couple of Stictodiscus diatoms for imaging at higher resolution. 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. Images stacked in Zerene (Pmax).
Stictodiscus sp. (Stictodiscus johnsonianus ?). ID from Schmidt’s Atlas plate 442, Figure 8 Santa Monica). Seems like the best option.
Stictodiscus sp. (Stictodiscus californicus var.). ID from Schmidt’s Atlas Plate 74, Figure 9 Camp Bai and Plate 444, Figures 1-4 Santa Monica. Tentative, but reasonable. Also some visual similarities with Stictodiscus nitidus.