Winter Fronds of the Prickly Fern. Dated: c. 1862. Dimensions: image: 18.5 x 24 cm (7 5/16 x 9 7/16 in.), oval mount: 34.2 x 51 cm (13 7/16 x 20 1/16 in.). Medium: albumen print. Museum: National Gallery of Art, Washington DC. Author: Geoffrey Beving