Three examples of Surirella constricta mounted in Styrax. Prepared by Watson and Sons Ltd. Olympus BHB microscope using 450nm LED light. As well as the group, I imaged one using the 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. 48 images stacked in Zerene (Pmax). Viewed from the underside, with the rim upwards towards the coverslip.
Surirella constricta W.Smith 1851. Published in: Smith, W. (1851). Notes on the Diatomaceae, with descriptions of British species included in the genera Campylodiscus, Surirella and Cymatopleura. Annals and Magazine of Natural History, series 2 7: 1-14, pls I-III. Page 9. Homotypic synonym: Surirella smithii var. constricta (W.Smith) A.Cleve 1922.