Epiphytically

A currant was common, always growing epiphytically on the trunks of large trees. ❋ Unknown (1864)

_Rhododendron Dalhousiae_ grows epiphytically, a slender shrub, bearing from three to six white lemon-scented bells, four and a half inches long and as many broad, at the end of each branch. ❋ Unknown (1864)

A short-stemmed palm (_Phoenix_) was tolerably abundant, and a small tree (_Pterospermum_) on which a species of grass grew epiphytically; forming a curious feature in the landscape. ❋ Unknown (1864)

These plants grow epiphytically in trees and so are accustomed to some protection. ❋ Unknown (2010)

You can't really call these geophytes, because the pseudobulbs are nowhere near the ground; the orchids grow epiphytically, on the trunks or branches of trees. ❋ Unknown (2010)

They typically grow epiphytically -- getting moisture and nutrients from the air -- with their roots attached to trees or on rocks, in warm, humid, shady locations. ❋ Unknown (2009)