Dryopteris erythrosora, the autumn fern, Japanese wood fern, or copper 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.
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 fronds have a coppery tint when young, but mature to dark green. It has an upright to down-lying rhizome which is thick and branched, so that it forms several crowns.
The leaves are funnel-shaped with the top ones being leathery shiny, divided twice, triangular in shape and pointy. The individual leaflets are narrow lanceolate. Its edge is almost completely sown up.
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.
Dryopteris erythrosora can tolerate a drier soil than many ferns, but is most successful in moist, humus-rich soil, with a pH range of 6.1 to 7.5, with morning or late afternoon sunshine but not during the middle of the day. It is hardy zones 5 to 11. Numerous cultivars have been selected, including 'Prolifica' and 'Viridosora'. Propagation is by division in spring, separating the small crowns from the larger crowns, or by spores. It is raised as an ornamental plant in gardens because of its color change in the foliage, which change from dark red to dark green, but not very often.
- "Dryopteris erythrosora". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA).
- The Natural History Museum of Los Angeles County Foundation: Dryopteris erythrosora
- Harrison, Lorraine (2012). RHS Latin for gardeners. United Kingdom: Mitchell Beazley. p. 224. ISBN 9781845337315.
- RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964.
- Edward F. Gilman: Dryopteris erythrosis . Fact Sheet FPS-189, Environmental Horticulture Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, 1999.
- "RHS Plant Selector – Dryopteris erythrosora". Retrieved 16 July 2013.
- "AGM Plants – Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 34. Retrieved 6 February 2018.
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