An arrangement of Nitzschia obtusa var. scalpelliformis from Deal (presumably Deal, Kent, UK). Yellowing and some degradation of the mountant and some diatom movement. The degradation can be seen in the 10x objective image. Prepared by William Allott Firth. 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. 58 images stacked in Zerene (Pmax).
Nitzschia obtusa var. scalpelliformis (Grunow) Grunow 1881. Published in: Van Heurck, H. (1881). Synopsis des Diatomées de Belgique Atlas. pp. pls XXXI-LXXVII [31-77]. Anvers: Ducaju et Cie. Plate LVXVII [67], Figure 2. This name is currently regarded as a synonym of Nitzschia scalpelliformis Grunow 1880. Publication Details: Nitzschia scalpelliformis Grunow 1880. Published in: Cleve, P.T. & Grunow, A. (1880). Beiträge zur Kenntniss der arctischen Diatomeen. Kongliga Svenska Vetenskaps-Akademiens Handlingar 17(2): 1-121, 7 pls. Page 92 (as ‘Nitzschia (obtusa var. ?) scalpelliformis‘).