is a specific kind of: fern.

is a broader term that covers: Dryopteris fragrans, fragrant cliff fern, fragrant shield fern, fragrant wood fern | Dryopteris filix-mas, male fern | Dryopteris marginalis, evergreen wood fern, leatherleaf wood fern, marginal wood fern | Dryopteris oreades, mountain male fern.

is a member of: Dryopteris, genus Dryopteris.