It appears to be a Mexican Male Fern, but there is one way to be sure. The Mexican Male Fern continues to produce new fronds throughout it's growing season, until frost. Other members of the Genus Dryopteris do not.
Several Labs produce the Mexican Male Fern in vitro, but I would be willing to wager a tidy sum, that all of those are not true to name. I once purchased Fern liners from one of them and received plants with the proper labels, but the plant was of an entirely different Genus.
Here's a link to the Hardy Fern Foundation Library and an outline, with a description of Dryopteris pseudo-filix-mas (Mexican Male Fern).
Hope yours was correctly labeled!
Rb

Here is a link that might be useful: Mexican Male Fern