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There can also be several leaf outlets per year. When budding, the young fronds are coppery red and later green. The leaf stalks are about a third as long as the leaf, striated, yellow to red, with linear to lancet-shaped brown scales, containing two large and several small vascular bundles in a cross-sectional drawing. The individual leaflets are narrow lanceolate. The leaves are funnel-shaped with the top ones being leathery shiny, divided twice, triangular in shape and pointy. It has an upright to down-lying rhizome which is thick and branched, so that it forms several crowns. The fronds have a coppery tint when young, but mature to dark green.

It is semi-evergreen (in cooler climates), with bipinnate fronds 30–70 cm (12–28 in) tall by 15–35 cm (6–14 in) broad, with 8–20 pairs of pinnae. The specific epithet may really be a reference to the red indusia, which cover the sori. So erythrosora literally means red heap, referring to the red sori on the undersides of the pinnules. The specific epithet, erythrosora, is derived from two Ancient Greek words, ἐρυθρός ( eruthrós) meaning red, and σωρός ( sōrós) meaning heap. Dryopteris erythrosora, the autumn fern or Japanese shield fern, is a species of fern in the family Dryopteridaceae, native to east Asia from China and Japan south to the Philippines, growing in light woodland shade on low mountains or hills.