Strong wind brings strange leaves?

The late winter/early spring finds lots of leaves in the Phactors' various flower beds.  This is because that's where we put them and where they belong.  Sometimes you notice something unusual among the usual assortment of leaves and this morning was one of those times.  It has been quite windy once or twice in the past few weeks, but doubt very much this blew in from the tropics.  The leaf is quite unmistakable, it's a frond of a staghorn fern, a large tropical, epiphytic fern.  The university glass house has several, a couple of unusual massive size.  In this part of the world staghorn ferns are a difficult houseplant at best.  They would be happiest growing in your shower if you had a skylight to provide enough light.  Otherwise, forget it.  Suffice it to say, among the tropical plants in our possession, this isn't one. This was found in the front garden near the neighbor's driveway, but they are not really very much on plants outside, let alone inside, so it remains a mystery where it came from although clearly it has not been there all winter as it is still fairly fresh. It will still compost nicely.