Selected diatoms from Samoa. Some issues with the mountant. Unknown maker. Olympus BHB microscope using 450nm LED light. I selected a Trigonium sp. for imaging at higher resolution with a 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. 47 images stacked in Zerene (Pmax).
See Schmidt’s Atlas (1874-1959, Plate 79, Figure 4) of a specimen from Samoa, given as Triceratium formosum var. pentagonalis. Trigonium formosum var. pentagonale (A.W.F.Schmidt) Desikachary & Prema 1987. Published in: Desikachary, T.V. & Prema, P. (1987). Diatoms from the Bay of Bengal. In: Atlas of Diatoms. Fasc. III. (Desikachary, T.V. Eds), pp. 1-10, pls. 222-331. Madras: Madras Science Foundation. Page 9.
Also a Grammatophora sp. at the top right. Possibly Grammatophora undulata.
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.