Question
Do you know the name of a plant growing from elbow in tree - has air roots, small red orchid-like flowers in shape of a cross. No soil in elbow of tree - just leaf litter.

Answer
There was no picture accompanying your question.  What is the location of this plant?  Florida? Java? Belize? It isn't clear whether this is growing in someone's yard or in the wild.  You just haven't provided enough information for me to even guess at the answer.  If you have more detail, please provide it.  Thanks