1. C.192.c.1, 4(213) Reference (shelfmark): C.192.c.1, 4(213) Title: Polysiphonia violacea. Photographer: Atkins, Anna Scope & Content: Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp of 11 Oct 1851 on reverse. Collection Area: Printed Collections Languages: Not applicable Date Range: c 1851 Extent: 1 item