Aulacodiscus oreganus from California. Single example on the slide, mounted with the processes (all present), facing upward facing the coverslip. Described as ‘rare’. Prepared by Arthur Charles Cole. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 66 images stacked in Zerene (Pmax).