It's rather unusual looking for a fern. The leaves just don't look fern-like, whatever that is. But, once you see the fertile frond, it is quite evidently a fern.
|The fertile frond looks very similar to Cinnamon Fern, Osmunda cinnamomea, a genus-mate, which otherwise look nothing like each other|
|The leaves resemble Locust leaves more so than typical fern leaves|