Athyrium niponicum

Athyrium niponicum, the Japanese painted fern, is a species of fern native to eastern Asia.
This species was redefined as a member of genus "Anisocampium" in 2011 based on phylogenetic analyses., but the genus has since been sunk into "Athyrium".
This deciduous fern has a creeping rhizome and a tuft-shape array of fronds. The fronds are variable in length, generally 30 to 75 centimeters long but occasionally over a meter in length. They have alternately arranged, subdivided pinnae. The spore-bearing sori on the undersides of the fertile pinnae are variable in shape, being "oblong, hooked, J-shaped, or horseshoe-shaped".
This is a commonly cultivated fern, especially "A. niponicum" var. "pictum". It thrives in many kinds of shady garden conditions and produces thick colonies of gray-green fronds with reddish midribs. 'Pictum' is also considered to be a cultivar; varieties and cultivars are bred to achieve midribs in many shades of red.
"A. niponicum" var. "pictum" has gained the Royal Horticultural Society’s Award of Garden Merit. 
as has the cultivar ‘Silver Falls’.