A arrangement of three Stylobiblium japonicum. Two (the lower two in the image) have the top facing the coverslip, while the one in the middle has it’s rim facing the coverslip. No makers name but 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. 24 images stacked in Zerene (Pmax).
This name is currently regarded as a synonym of Tetracyclus japonicus (P.Petit) Tempère & H.Peragallo. Schmidt’s Atlas Plate 282, Figures 1,2. Williams D. M. 2003. — The type material of Tetracyclus japonicus (Petit) Temp. & H. Perag. and Tetracyclus eckhardii Ehrenb. (Bacillariophyceae). Cryptogamie, Algologie 2003 (4): 333-340.