Two slides in one with this, and one of my ‘wish list’ diatoms. The diatom is Cyclotella antiqua from two makers.
the first slide has nine examples mounted in a square arrangement. From Stornoway, Scotland. No makers name, date or details of the mountant. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. 11mm removed from the tube to the camera to increase the field of view. Monochrome converted Nikon d850 camera. 30 images stacked in Zerene (Pmax).
I’ve done single frame cropped images of four of them to show some of the amazing structures.
Cyclotella antiqua 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 28, Plate V [5], Figure 49. This name is currently regarded as a synonym of Lindavia antiqua (W.Smith) Nakov, Guillory, M.L.Julius, E.C.Theriot & A.J.Alverson, 2015. Published in: Nakov, T., Guillory, W.X., Julius, M.L., Theriot, E.C. & Alverson, A.J. (2015). Towards a phylogenetic classification of species belonging to the diatom genus Cyclotella (Bacillariophyceae): Transfer of species formerly placed in Puncticulata, Handmannia, Pliocaenicus and Cyclotella to the genus Lindavia. Phytotaxa 217(3): 249-264. Page 254.
Also see: H. Kling & H. Håkansson (1988) A light and electron microscope study of Cyclotella species (Bacillariophyceae) from Central and Northern Canadian lakes, Diatom Research, 3:1, 55-82, DOI: 10.1080/0269249X.1988.9705017
Second slide is by CN Walter, and with a single diatom from Isle of Lewis, Hebrides, Scotland. Mounted in Styrax/Aroclor and dated 14/5/[19]67.
The diatom is dipping downwards towards the upper left, and is an underside view with the rim upwards towards the coverslip. Olympus BHB microscope using 450nm LED light. 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. 44 images stacked in Zerene (Pmax).
As mentioned above, this was one of my ‘wish list’ diatoms, mainly due to the lovely structures present. Very happy to have found 2 slides of it to image.