A strew slide from Alabama, USA. Prepared by Samuel Henry Meakin and mounted in Styrax. Lots of Terpsinoe diatoms and Actinocyclus octonarius var. ralfsii. I chose one to image which looked a bit different. I still think this is an Actinocyclus octonarius but not sure which variant. Viewed from the underside. 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. 21 images stacked in Zerene (Pmax).