A strew slide from McMurdo Sound, Antarctica. Prepared by Brian Darnton. Collected by P. Houpt. Wide variety of species present. The slides is quite low contrast, and although the mountant is not specified, I suspect it is a relatively low refractive index one. I have attempted to identify the species myself, so this should be kept in mind when reading the descriptions for the images.
Olympus BHB microscope using 450nm LED light. Charcotia decrescens and Stauroneis sp. imaged using a 63x Leitz Pl Apo NA 1.40 objective with oil immersion. Azpeitia tabularis, Coscinodiscus sp. ?, Pleurosigma sp., and Trigonium arcticum imaged using a 40x Leitz Pl Apo NA 1.00 objective with oil immersion. Olympus Aplanat Achromat condenser, oil immersion, slightly oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Images stacked in Zerene using Pmax.