Strew slide from Troublesome Gulley, Oamaru, New Zealand. Wide range of species present. Prepared by Klaus Kemp. Mounted in Pleurax and dated January 2001. 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. Image stacks prepared in Zerene (Pmax).
Podosira corolla. Fairly sure on this one.
Melosira sp.? View from the underside. I think this could be M. ornata, based on images in R. M. Crawford & P. A. Sims (2009) Anuloplicata Gleser, its species and relationships with Ellerbeckia Crawford and Truania Pantocsek within the Radialiplicataceae Gleser & Moisseeva, Diatom Research, 24:2, 253-272, DOI: 10.1080/0269249X.2009.9705801.