A slide of Glyphodesmis eximia from Rio de Janeiro. Prepared by Arthur Charles Cole. 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. 53 images stacked in Zerene (Pmax).
Published in: Greville, R.K. (1862). Descriptions of new and rare Diatoms. Series VII. Quarterly Journal of Microscopical Science, New Series, London 2: 231-236, pl. X. Interestingly in the description it says “At each extremity of the frustule there is a small empty space, caused by the abrupt termination of the transverse striae.”. In my image a dot pattern is seen within these empty spaces. The description also says, “The ordinary dimensions, however, may be said to be intermediate between figs. 6 and 7.”. I think this is an error and should say between Figs 7 and 8 (as Fig 6 is a different species in Plate X).