Two slides of Aulacodiscus asiaticus var. vallonea from Sendai (written Sandai on the slide), Japan. Prepared by Laurence Miles. Olympus BHB microscope using 450nm LED light. 20x Nikon Plan Apo NA 0.65 objective.Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera.
First is a partial example, in a nice clear mount.
53 images stacked in Zerene (Pmax). 11 processes. 421µm diameter (top to bottom), 424µm (left to right).
Second one is intact, but the mountant has yellowed.
54 images stacked in Zerene (Pmax). 10 processes. 409µm diameter (top to bottom), 406µm (left to right).
Aulacodiscus asiaticus var. vallonea Brun 1892. Published in: Schmidt, A.[W.F.] (1892). Atlas der Diatomaceen-kunde. Series IV: Heft 43/44. pp. pls 169-176. Leipzig: O.R. Reisland. Plate 169, Figures 3,4.