A selection of Actinoptychus vulgaris from Santa Monica, California, USA. The two on the right hand side are much lower in the mountant than the others. Prepared by William Allott Firth. Olympus BHB microscope using 450nm LED light. As well as the selection, I imaged one 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).
Actinoptychus vulgaris Schumann, 1867. Published in: Schumann, J. (1867). Preussische Diatomeen. Schriften der Königlichen Physikalisch-Ökonomischen Gesellschaft zu Königsberg 8: 37-68, 3 pls. Page 64, no fig.