Asplenium scolopendrium 'Angustifolia'
Native range: Spreading across Europe
Known names: ['Angustifolia'] Heart's Tongue Fern, Phyllitis scolopendrium
Hardiness: USDA Zone 5b - 9b
Mature Size: ~10" Tall x 15" Wide
Light: Morning sun, shade, dappled light
Water: Keep soil moist, not soaking
Soil: Standard garden/potting soil that retains moisture.
Dormancy Period: Evergreen in winter
Pet-Safe: Yes
Plant Size: Grown in 3" pot, shipped semi-bare root
 
'Angustifolia' Hart's Tongue Fern forms VERY ruffled, upright, evergreen fronds. 
"Scolopendrium" is Latin for "centipede", this species was named this because the sori is vaguely centipede-like.