An arrangement of three Navicula yarrensis in between two disc diatoms. Prepared by Flatters and Garnett Ltd. Olympus BHB microscope using 450nm LED light. As well as the arrangement I imaged two using the 63x Leitz Pl Apo NA 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). One was an underside view with the rim up towards the coverslip, the other had the rim down.
Navicula yarrensis Grunow 1876. Published in: Schmidt, A.[W.F.] (1876). Atlas der Diatomaceen-kunde. Series I: Heft 11. pp. pls. 41-44. Aschersleben: Verlag von Ernst Schlegel. Plate 46, Figures 1-6. This name is currently regarded as a synonym of Pinnunavis yarrensis (Grunow) H.Okuno 1975. Published in: Okuno, H. (1975). The fine structure of the frustules of the Bacillariophyta. In: Advance of Phycology in Japan. (Tokida, J. & Hirose, H. Eds), pp. 97-113. The Hague: W. Junk. Page 111, Figure 8 (2, 2a).