California maiden-hair
Adiantum jordanii
Pteridaceae

If I had a garden of my dreams, this is the one native fern I would definitely include. I suspect it would require quite a bit of moisture and could be challenging to grow in an artificial setting. That's Garland's waterfall in the background of the third photo, which had water running after a week of decent rain. Interestingly enough, this is not CA's only maiden-hair fern; there's another called southern maiden-hair (Adiantum capillus-veneris) that looks a lot like cilantro, the herb staple of many salsas.