This fern is kind of an oddball. It grows in cracks in rock walls, boulders, and cliffs. Like, directly out of the rock. It is adorably small and its rounded simple pinnate leaves give it a Jurassic Park feel (to me, I might be weird). It's almost always in full shade, occasionally even in waterfall spray (but more typically dry sites), and often with moss as its only companion. I collected some spores to try to propagate, and holy heck it was by far my most successful fern propagation. So now I have a bunch.
 
So that's all well and good, but as far as a garden plant...well, it's not ideal. It's a little too niche, maybe (see what I did there?). It needs shade, a decent amount of moisture, and apparently likes a small cozy home for its roots. It absolutely does not want a bunch of neighboring plants crowding it out. My thought is that polypody's love of rock crevices might be more a way to grow in the shade without neighbors than a need for a rocky substrate (relatable).
 
If you have a shaded rock wall or rock garden, give this guy a try. If you want to grow it more traditionally in the garden, go for it but keep it from getting crowded out (and let me know how it goes!). Better yet, try a little container garden. This might be my most container-friendly plant yet. It would go great with some cool rocks, some cool moss, maybe an alumroot or wilcox penstemon, and some sedum. Keep in the shade, obviously.