Osmunda claytoniana

An uncommon fern that I've only seen in cultivation.

Plant habit at Hilltop Gardens in Bloomington, 4/2003.

A sporophyll, showing the darker sporangium-producing and the lighter, purely vegetative, portions of the leaf; at Hilltop Gardens, 4/2003.

A closer view of the sporangium-producing region, 4/2003.