An arrangement of Isthmia nervosa. Yellowed mountant. Prepared by Watson and Sons Ltd. Olympus BHB microscope using 450nm LED light. As well as arrangement I imaged one using the 40x Leitz Pl Apo 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted d850 camera. 73 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.