A strew from Año Nuevo, California. Recent marine material. Diatomite sample from H Jay Margolis. Diatom sample from the collection of Colonel William D Fleming, US Army, MD FRMS. Nearly all Isthmia nervosa. Mounted in Pleurax and dated 30/5/2026. Prepared by Michel Haak. Olympus BHB microscope using 450nm LED light. As well as the wider view I imaged one using the 20x Nikon Plan Apo 0.65 objective. Olympus Aplanat Achromat condenser, oil immersion. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 49 images stacked in Zerene (Pmax).
Isthmia nervosa Kützing 1844. Published in: Kützing, F.T. (1844). Die Kieselschaligen Bacillarien oder Diatomeen. pp. [i-vii], [1]-152, pls 1-30. Nordhausen: zu finden bei W. Köhne. Page 137, Plate 19, Figure 5.