si-american-art-museum:

Lygodium Icandeus, Isaac Rehn, ca. 1865, Smithsonian: American Art Museum

Size: sheet and image: 14 x 17 ¼ in. (35.5 x 43.8 cm.)
Medium: albumen photogram

http://americanart.si.edu/collections/search/artwork/?id=34374