An arrangement of Pleurosigma compactum in between two disc diatoms. Some issues with the mountant. Recent marine material. Prepared by Eduard Thum. Olympus BHB microscope using 450nm LED light. As well as the wider field of view 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. 100 images stacked in Zerene (Pmax).
Pleurosigma compactum Greville 1857. Published in: Greville, R.K. (1857). Description of some new Diatomaceous forms from the West Indies. Quarterly Journal of Microscopical Science, London 5: 7-12, pl. III. Page 12, Plate III [3], Figure 9. This name is currently regarded as a synonym of Rhoicosigma compactum (Greville) Grunow 1868. Published in: Grunow, A. (1868 ‘1867’). Algae. In: Reise der österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wüllerstorf-Urbair. Botanischer Theil. Erster Band. Sporenpflanzen. (Fenzl, E. et al. Eds), pp. 1-104. Wien [Vienna]: Aus der Kaiserlich Königlichen Hof- und Staatsdruckeri in Commission bei Karl Gerold’s Sohn. Page 112.