Triceratium radiato-punctatum from Nagy Curtos, Hungary. Single example on the slide, mounted with the rim upwards towards the coverslip (underside view). Some of the dye from around the diatom has ended up in the adhesive (looks to be adhered to the slide rather than the coverslip). Small droplets throughout the mountant. No makers name, but based on the handwriting this is by Herbert William Hutton Darlaston. 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. 49 images stacked in Zerene (Pmax).
Trigonium radiatopunctatum (Schmidt in Schmidt et al.) Hustedt in Schmidt et al., 1959. Schmidt’s. Schmidt’s atlas, Plate 94, Figure 14, and Plate 469, Figures 6-12 (as Triceratium (Trigonium) radiatopunctatum).