Orchid roots of epiphytic or lithophytic needs a lot of air for it to function at its best.    From Wordnik.com.  [EzineArticles] Reference

Ve lithophytic glochidium on depot, and one of the decimalization ethanal out in the silicon at a big oppression of ethnically bootlicking abstractedness bags.    From Wordnik.com.  [Rational Review] Reference

Others are lithophytic and dwell on rocks.    From Wordnik.com.  [Dendrobium: Family Orchidaceae's tree of life] Reference