A strew of Pleurosigma angulatum (and others) from the River Welland, The Wash, UK. No1 coverslip. Dated December 1928. Mounted in α bromo naphthalene. Some mountant loss (not unusual for this mountant). Prepared by John J Grover, Rotherham. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo 0.45 objective. Olympus Aplanat Achromat condenser, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Single unstacked image.