Nephrolepis cordifolia.

Nephrolepis cordifolia Presl. Polypodiaceae. Ladder Fern.

Mexico, Japan and New Zealand. This fern, says J. Smith, produces underground tubers like small potatoes, which are used for food by the natives of Nepal.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.