A strew slide from Kamischev, Russia. Mounted in Hyrax. Good range of species. Severely yellowed mountant. Lots of debris. No makers name, but I think this was by NBS (Northern Biological Supplies). As well as the strew, I did a stack of an Entogoniopsis polycistinorum using the 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. 34 images stacked in Zerene (Pmax). Some debris present as well.
Entogoniopsis polycistinorum (Pantocsek) N.I.Strelnikova, P.A.Sims, J.Witkowski & D.M.Williams, 2015. Published in: Witkowski, J., Sims, P.A., Strelnikova, N.I. & Williams, D.M. (2015). Entogoniopsis gen. nov. and Trilamina gen. nov (Bacillariophyta): a survey of multipolar pseudocellate diatoms with internal costae, including comments on the genus Sheshukovia Gleser. Phytotaxa 209: 1-89, 253 figures, 1 table. Page 13 (as ‘polycistinora‘). Basionym: Triceratium polycistinorum Pantocsek, 1892.