An arrangement of three Navicula americana from Montgomery, Alabama, USA. Cracked coverslip. Prepared by JA Long. 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. 11mm removed from the tube to the camera to increase the field of view. Monochrome converted Nikon d850 camera. 58 images stacked in Zerene (Pmax).
Navicula americana Ehrenberg 1843. Published in: Ehrenberg, C.G. (1843). Verbreitung und Einfluss des mikroskopischen Lebens in Süd- und Nord-Amerika. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1841: [291]–445 + [1, Berichtigungen], pls 1–4. Page 417 (as ‘Navicula? americana‘). This name is currently regarded as a synonym of Sellaphora americana (Ehrenberg) D.G.Mann 1989. Published in: Mann, D.G. (1989). The diatom genus Sellaphora: separation from Navicula. British Phycological Journal 24(1): 1-20, 58 figs, 1 table. Page 2.