canker brake(n = noun.plant) christmas fern, dagger fern, evergreen wood fern, polystichum acrostichoides - North American evergreen fern having pinnate leaves and dense clusters of lance-shaped fronds;
is a kind of fern
is a member of genus polystichum, polystichum

air brake, american rock brake, apple canker, blight canker, brake, brake band, brake cylinder, brake disk, brake drum, brake failure, brake light, brake lining, brake pad, brake pedal, brake shoe, brake system, canker, canker bloom, canker blossom, canker fly, canker rash, canker sore, chestnut canker, cliff brake, coaster brake, disc brake, disk brake, dive brake, drum brake, emergency brake, foot brake, hand brake, hydraulic brake, hydraulic brake cylinder, parking brake, pasture brake, power brake, purple rock brake, rock brake, shooting brake, spider brake, stem canker, water canker