1. C.192.c.1, 2(92) Reference (shelfmark): C.192.c.1, 2(92) Title: Helminthocladia viriscens. Photographer: Atkins, Anna Scope & Content: Genre: Scientific Photography Cyanotype negative photogram of algae specimens, on paper watermarked 'J Whatman Turkey Mill 1843.' Collection Area: Printed Collections Languages: Not applicable Date Range: c 1843 Extent: 1 item