Navicula angelorum from Palos Verdes, California, USA. Single example on the slide. Fossil marine material. W.D.F. #355. Ca.Bal. (Canada Balsam) mountant and dated August 1967. Prepared by ECP Bone. 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. 43 images stacked in Zerene (Pmax). Slightly tilted on the slide. Unusual to see Canada Balsam on am ECP Bone slide – not sure if I have any others.
Navicula angelorum Cleve 1881 (as ‘Navicula (excavata var.?) Angelorum‘). Published in: Cleve, P.T. (1881). On some new and little known diatoms. Kongliga Svenska-Vetenskaps Akademiens Handlingar, N.F. 18(5): 1-28, 6 pls. Page 8, Plate II [2], Figure 20. This name is currently regarded as a synonym of Navicula spectabilis f. angelorum (Cleve) Hustedt.