Strange parasites

During our trip to Eldama Ravine not long ago, we walked down to a small waterfall in a micro-rain forest.

I was fascinated to see these parasitic plants growing out of a moss-covered tree trunk. The leaves looked more like oak than something that would normally be growing in a rain forest.

I'm not sure how this leaf losts its main green bits and kept the structural veins. Maybe another parasite had a meal!