Stictodiscus californicus var. areolata from Allan’s Farm, Oamaru, New Zealand. Single example on the slide. Mounted in Styraclor and dated July 1995. Prepared by Bernard Hartley. 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. 30 images stacked in Zerene (Pmax).
Stictodiscus californicus var. areolatus Grunow 1882. Published in: Schmidt, A.[W.F.] (1882). Atlas der Diatomaceen-kunde Series II : Heft 19. pp. pls 73-76. Aschersleben: Ernst Schlegel’s Verlag. Plate 74, Figure 1 (as ‘areolata‘). Homotypic synonym: Stictodiscus areolata (Grunow in Schmidt et al.) Thum 1889.