This alien-looking plant sprouted very suddenly from a clump of moss, several months after the moss had been brought in from the outdoors. I've never seen anything like it. It doesn't have a grass-like shaft, it resembles a fern but isn't a variety I know or can find through research. It's also definitely not part of the moss. Originally from California, if that helps. Also, when it sprouted it came up with it's seed pod/shell trapped on it's head, so I know it came from a seed. I'm extremely curious, any ideas?
I think it could be a baby conifer tree. Those seem to have multiple bright green cotelydons and look sort of like that. I found a couple of pictures on the internet that didn't look exactly like the one you have, but had a certain resemblance, and there are certainly lots of different conifers out there.
These are Douglas fir cotelydons, picture from Wikipedia :
This picture of an infant ghost pine is from here:
This is a Serbian Spruce seedling from here: