Christmas Fern 

Polystichum acrostichoides (Michx.) Schott 

Christmas Fern (S. Peterson @ USDA-NRCS PLANTS Database)

Family: Dryopteridaceae 
Habitat: Shaded slopes; moist and open woods; swamps 
Color: Dark green foliage 
Height: 12-30 in 
Exposure: Light filtered sunlight to full shade 
Soil Moisture: Moist to moderately dry 
Soil Quality: Rich 
Garden Uses: Excellent groundcover for shady areas; pots. 
Notes: Scatter through a moist garden or mixed 
border(forms an asymmetrical clump). Voles are 
attracted to them as is the Asian Lily Leaf Beetle. 
USDA Plants Profile http://plants.usda.gov/java/profile?symbol=POAC4