Polystichum tsus-simense, also known as the Korean rock fern, is a small, tufted evergreen fern with glossy, dark green, upright fronds that are finely divided and have a delicate, spine-pointed tip, making it a good choice for shady areas. 
 
Appearance:
It forms a low, dense clump with erect, narrowly lance-shaped fronds. 
The fronds are glossy, dark green, and finely divided, with a delicate, spine-pointed tip on each small pinna. 
New fronds can have a purplish cast. 
Black stems and silvery-white scales are also characteristic. 
Growth Habit:
It's evergreen, meaning it retains its foliage year-round. 
Old fronds can be cut back in early spring to reveal the new, purple-tinged growth.