Realism Questions

[CarnivorousJelly]

I did a little bit of research for you, since I was curious about this myself.

From what I've gathered, all plants require some form of lights. If it has green pigments, it has chlorophyll, meaning it photosynthesizes, meaning it needs light to make its own food. There are some plants that can survive in low light conditions (Peperomia, Chinese Evergreen, Dieffenbachia, Snake Plant, Philodendron, Zeezee Plant, Arrowhead Vine, Pothos, Fuchsia, Bleeding Hearts, Primrose, Forget-me-not, Jacob's Ladder, Impatiens, Begonias, Lily of the Valley, Wild Violet, Hosta Lily, and Cast-Iron Plant), but they won't thrive and would most-likely have to have been artificially introduced to the area. Some species of mushrooms, and other fungi, require absolutely no light at all, so these would be your best bet.

That said, most people are willing to suspend disbelief and just accept that there are ferns and mosses growing miles and miles underground.

Sources: Google; type in "low-light plants", then double-check the list of species that come up by typing in "[plant species] care instructions".

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Edit: BeeKayK, you ninja :p