An arrangement of Trinacria regina from Jutland. No makers name but based on style and handwriting this is likely by JA Long. 20x Nikon Plan Apo 0.65 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 76 images stacked in Zerene (Pmax).
Trinacria regina Heiberg 1863. Published in: Heiberg, P.A.C. (1863). Conspectus criticus diatomacearum danicarum. Kritisk oversigt over de danske Diatomeer. pp. 1-135, 6 pls. Kjøbenhavn: Wilhelm Priors Forlag. Page 50, Plate 3, Figure 7.