Epiphytic plants in D.R.

Epiphyte plants upon a palo de viento (Schefflera tremula) in Sierra de Neiba National Park.

Epiphyte plant of the Bromeliaceae family (Red one) and an specie of fern growing upòn a trunk.

An epiphyte is a plant that grows non-parasitically upon another plant (such as a tree), and derives its moisture and nutrients from the air, rain, and sometimes from debris accumulating around it instead of the structure it is fastened to. An epiphytic organism that is not a plant is not called an epiphyte. Epiphytes are usually found in the temperate zone (e.g., manymosses, liverworts, lichens, and algae) or in the tropics (e.g., many ferns, cacti, orchids, andbromeliads).Epiphytes provide a rich and diverse habitat for other organisms including animals, fungi, bacteria, and myxomycetes.

Epiphytic plants use photosynthesis for energy and (where non-aquatic) obtain moisture from the air or from dampness (rain and cloud moisture) on the surface of their hosts. Roots may develop primarily for attachment, and specialized structures (for example, cups and scales) may be used to collect or hold moisture.

More info: en.wikipedia.org/wiki/Epiphyte