Moss covers every rock around the park, and there are good amounts of lichens and bryophytes as well.
While I was there, I found a lot of mushrooms. If you're a mycologist, you'll enjoy the place.
Unfortunately, my mycology skills are pretty non-existent right now. I'll have to come back to the ecology and identification of these at a later date. But still, very neat, and a good variety for only a cursory glance. I only had an hour or two there, but I'm positive there's a lot more to explore and discover.
Conocephalum conicum - Scented liverwort/Snake liverwort
The liverworts, as usual, were quite pretty as well. They were very prevalent in the moist areas near the bottom and sides of the caves, and by the waterfalls.
I found one very interesting insect while examining the lichen on a tree. Strangely enough, the lichen started to move. It actually turned out to be the larva of a lacewing, an insect within the order Neuroptera. Lacewing larvae will routinely cover themselves with debris: lichen, dirt, dead insects, etc. to help them blend in with their surroundings, or hide their bodies. It's pretty good camouflage, you wouldn't know they were there if they stayed still.
Sadly, with only an hour and a half to explore, I missed a lot. The only solution to that, of course, is to return with more time to explore.