1. C.192.c.1, 5(268) Reference (shelfmark): C.192.c.1, 5(268) Title: Callithamnion purpurascens. Photographer: Atkins, Anna Scope & Content: Genre: Scientific Photography Cyanotype negative photogram of four algae specimens, 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