Arachnoidiscus ehrenbergii from Allan’s Farm, Oamaru, New Zealand. Single example on the slide. Mounted in Styraclor and dated June 1995. Prepared by Bernard Hartley. 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. 50 images stacked in Zerene (Pmax). Slide also says ‘var.’ after the name, and I’m not sure why as it looks like the images of A. ehrenbergii I’ve seen.
Arachnoidiscus ehrenbergii Bailey 1849. Published in: Ehrenberg, C.G. (1849). Weitere Mittheilung über Resultate bei Anwendung des chromatisch-polarisirten Lichtes für mikroskopische Verhältnisse. Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königlich-Preussischen Akademie der Wissenschaften zu Berlin 1849: 55-76. Page 64, adnot.