Here are some plants I have been keeping under glass in hopes of planting in terrariums. There is a small parlor palm cutting, some rhizomes of rabbits foot fern, some selaginella, and that odd dry looking thing I found on my hike. I think there are some sword fern rhizomes in there too and some birdsnest or Suzy Foo fern.
I basically cut bits off all my ferns and mash them together in dirt. Once something starts growing well I consider putting it in a terrarium.