Three examples of Hyalodiscus subtilis from Kamischev, Russia. Mounted in Styrax and dated 8/6/[19]65. Prepared by CN Walter. Olympus BHB microscope using 450nm LED light. As well as the arrangement, I imaged the two on the right hand side using the 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 39 images stacked in Zerene (Pmax). 60 images stacked in Zerene (Pmax).
Hyalodiscus subtilis Bailey 1854. Published in: Bailey, J.W. (1854). Notes on new species and localities of microscopical organisms. Smithsonian Contributions to Knowledge 7(3): 1-15, un-numbered plate. Page 10, Plate 1, Figure 12. This name is currently regarded as a synonym of Hyalodiscus scoticus (Kützing) Grunow 1879. Published in: Grunow, A. (1879). Algen und Diatomeen aus dem Kaspischen Meere. New species and varieties of Diatomaceae from the Caspian Sea, translated with additional notes by F. Kitton. Journal of the Royal Microscopical Society 2: 677-691, pl. 21. Page 690, Plate 21, Figure 5. Source of synonymy: Desikachary, T.V. & Sreelatha, P.M. (1989). Oamaru diatoms. Bibliotheca Diatomologica 19: [1]-330, including 145 plates.