Rutilaria epsilon mounted in Styrax. Single example on the slide. Prepared by Watson and Sons Ltd. 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. 55 images stacked in Zerene (Pmax).
Rutilaria epsilon Greville 1863. Published in: Greville, R.K. (1863). Descriptions of new and rare diatoms. Series X. Quarterly Journal of Microscopical Science, Series 2 3: 227-237, pls IX, X. Page 228, Plate IX [9], Figure 1.
Also see Published in: Ross, R. (1995). A revision of Rutilaria Greville (Bacillariophyta). Bulletin of the Natural History Museum, London, Botany 25(1): 1-93, 20 pls. In particular, Pages 54-58. R. epsilon seems to be a complicate one from a naming point of view. The one on this slide does look like the example from Monterey, California (Figures 72,73).