Polystichum acrostichoides (Christmas fern) is an evergreen fern native to eastern North America from Nova Scotia west to Minnesota and south to Florida and eastern Texas.  It is one of the most common ferns in eastern North America, being found in a wide variety of habitats and locations.
The common name of Polystichum acrostichoides, Christmas fern, derives from its evergreen fronds, with fronds growing to 30-80 cm long and 5-12 cm broad, divided into 20-35 pairs of pinnae. The spores are produced on small pinnae toward the apex of the frond.
Christmas resembles the Pacific Coast sword fern, Polystichum munitum, but does not make the huge clumps of that fern, and differs from it in the constriction of the fertile pinnae. Like other ferns of the genus Polystichum, it is allied to the wood ferns, genus Dryopteris, to which it is often found growing in close proximity.
Polystichum acrostichoides, the Christmas fern, is popular in cultivation as an ornamental plant for gardens and natural landscaping, because it is easy to grow and can be used in many settings and soils.
It has been noted that this fern can serve a soil conservation and erosion control function on steep slopes. The fronds are semi-erect until the first hard frost, after which they recline to be flat on the ground, effectively holding in place fallen leaves so that they become soil on the slope.
- USDA . accessed 11.1.2011
- "Polystichum acrostichoides". Integrated Taxonomic Information System. Retrieved September 25, 2006.
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- USDA PLANTS Profile for Polystichum acrostichoides (Christmas fern)
- Flora of North America: Polystichum acrostichoides
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