A strew slide which looks to be mainly one species – Stephanodiscus novae-zeelandiae – from Rotorua, New Zealand. Prepared by JA Long. Olympus BHB microscope using 450nm LED light. I picked a couple of examples 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. Images stacks prepared in Zerene (Pmax). One viewed from above, one from below.
Stephanodiscus novae-zeelandiae Cleve 1881 (as ‘novaezeelandiae‘). Published in: Cleve, P.T. (1881). On some new and little known diatoms. Kongliga Svenska-Vetenskaps Akademiens Handlingar, N.F. 18(5): 1-28, 6 pls. Page 21, Plate V, Figure 62. This name is currently regarded as a synonym of Cyclostephanos novae-zeelandiae (Cleve) Round. Source of synonymy: Theriot, E., Håkansson, H., Kociolek, J.P., Round, F.E. & Stoermer, E.F. (1988 ‘1987’). Validation of the centric diatom genus name Cyclostephanos. British Phycological Journal 22(4): 345-347.