Athyrium otophorum

Athyrium otophorum, the eared lady fern, is a species of fern in the family Athyriaceae, native to Japan and east Asia. It is deciduous and grows in a tufted oval formation to tall and wide. The triangular fronds open pale green before turning grey-green with maroon stems. 
Hardy down to it is suitable for cultivation in any moist, partially-shaded spot with good drainage.
In cultivation in the UK, this plant has gained the Royal Horticultural Society’s Award of Garden Merit, as has the variety "A. otophorum" var. "okanum".