Epiphytic fungus

An epiphytic fungus is a fungus that grows upon, or attached to, a living plant. The term epiphytic derives from the Greek "epi-" (meaning 'upon') and "phyton" (meaning 'plant').
Examples.
Many examples of epiphytic microorganisms exist. The ergoline alkaloids found in "Convolvulaceae" are produced by a seed-transmitted epiphytic clavicipitaceous fungus .