Pheonix tree. Just when you think they have died, perhaps they have fallen over, snapped in two, or their whole crown dies off, a tree will suddenly grow back. What you get is a tree ten times more interesting than before. Some species like oak can phoenix again and again over hundreds of years.
Epiphyte. A plant that grows on another plant. Sometimes just moss or lichen, but ferns and larger plants become epiphytes in rainforests as they are less likely to dry out.
Suspended Soils. In the nooks and crannies of trees, moss, leaves and twigs decay in moist, rainforest conditions and leave behind a bit of compost. The older the tree the larger and more numerous these compost pockets can become. Suspended soil can support little epiphyte gardens of woodland plants in the tops of trees.