Make the trees have really big, vine-like roots, allow them to grow upside down and on their side, and they should have spikes that stick on to the logs. They should try to avoid the flat plains look and try to keep the cave look. The leaves shouldn't be in a normal pattern (for ideas lycopods (look at trees), Ginkgo and Cycad). The roots should look like they're from mangroves but the roots will be really thick. Different tree species would also be nice.
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