Title: Porphyra vulgaris
Object type: Photogram
Date: ca. 1853
Artist:  Anna Atkins 
Artist bio: British, 1799–1871
Artist nationality: British
Artist role: Artist
Medium: Cyanotype
Dimensions: Image: 25.3 x 20 cm (9 15/16 x 7 7/8 in.)
Classification: Photographs
Credit line: Gilman Collection, Purchase, The Horace W. Goldsmith Foundation Gift, through Joyce and Robert Menschel, 2005
Department: Photographs
Repository: Metropolitan Museum of Art, New York, NY