A really nice arrangement of 12 selected diatoms mounted in Styrax and dated December 1968. Called ‘Slide 25’. Species given as follows (from top to bottom);
Triceratium pentacrinus – Egypt
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Surirella nevadensis – California
Gomphomena geminatum – Scotland
Stephanodiscus astraea – Toome Bridge
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Stauroneis inflata – New Zealand
Actinocyclus octonarius – Maryland
Actinoptychus heliopelta – Maryland
Arachnoidiscus ornatus – California
Neidium tumescens – Cherryfield
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Cymbella australicum (sic, australica) – New Zealand
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Navicula lyroides – England
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Actinoptychus grundleri – California
Olympus BHB microscope using 450nm LED light. As well as the arrangement I selected a couple to image at higher resolution (Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Images stacked in Zerene using Pmax).
Surirella nevadensis G.D.Hanna & W.M.Grant, 1931. Published in: Hanna, G.D. & Grant, W.M. (1931). Diatoms of Pyramid Lake, Nevada. Transactions of the American Microscopical Society 50(4): 281-297. Page 289, Plate XXVI, Figure 3,4. 63x Leitz Pl Apo NA 1.4 objective, oil immersion.
Cymbella australica (A.W.F.Schmidt) Cleve, 1894. Published in: Cleve, P.T. (1894). Synopsis of the naviculoid diatoms. Part I. Kongliga Svenska Vetenskapsakademiens Handlingar Series 4 26(2): 1-194, 5 pls. Page 176. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. This is spelt as ‘australicum‘ on the type written list, but I presume this is incorrect and should be ‘australica‘.