Actinoptychus decorans. Single example on the slide. Some issues with the mountant/adhesive to the coverslip. No location or mountant given. Unknown maker. 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. 55 images stacked in Zerene (Pmax).
Actinoptychus decorans A.W.F.Schmidt 1890. Published in: Schmidt, A.[W.F.] (1890). Atlas der Diatomaceen-kunde Series IV: Heft [39/40]. pp. pls 153-160. Leipzig: Fues’s Verlag (R. Reisland). Plate 155, Figure 14 (hence the ‘AS 155 14’ on the label).
I recently acquired about 30 more slides by this maker to add to the ones I already had, so if you want to see others by them, search for AAAAA in the Search option at the top of the page, and I’ll include this in each of the pages for them.