Navicula bullata from Cambodia. Single example on the slide, tilted downwards towards the bottom right. Prepared by WA Firth. 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. Monochrome converted Nikon d850 camera. 89 images stacked in Zerene (Pmax).
Navicula bullata G.Norman 1861. Published in: Norman, G. (1861). On some undescribed species of Diatomaceae. Transactions of the Microscopical Society, London, New Series 9: 5-9, pl. II. Page 8, Plate II [2], Figure 7. This name is currently regarded as a synonym of Navicula lyra f. bullata (G.Norman) Cleve 1895. Published in: Cleve, P.T. (1895). Synopsis of the naviculoid diatoms. Part II. Kongliga Svenska Vetenskapsak Akademiens Handlingar 27(3): 1-219, 4 pls.. Page 63 (as ‘var. elliptica f. bullata ‘).