Sporophyte fronds of what I`m presuming is Adiantum
peruvianum, doing their thing in one of In Situ's vertical
They’re pretty cute, though, either way. As soon as we start to see more mature foliage on these plants I’ll update again with a more conclusive ID. The plants pictured here are way up at the top of the wall, and should produce a nice (albeit unplanned) cascading effect once they get going (again, presuming they’re even A. peruvianum).