An arrangement of seven Pinnularia alpina from Switzerland. Some issue with the mountant, it has fractured and partially come away either the slide or coverslip. No makers name. Olympus BHB microscope using 450nm LED light. As well as the arrangement 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. 52 images stacked in Zerene (Pmax).
Pinnularia alpina W.Smith 1853. Published in: Smith, W. (1853). A synopsis of the British Diatomaceae; with remarks on their structure, function and distribution; and instructions for collecting and preserving specimens. The plates by Tuffen West. In two volumes. Vol. I. pp. [i]-xxxiii, 1-89, pls I-XXXI. London: John van Voorst, Paternoster Row. Page 55, Plate XVIII [18], Figure 168.