Ophioderma pendulum
Introduction '''''Ophioderma pendulum''''' is sometimes known as the '''old-world adder's-tongue'''. In Malaysia, it is known as '''daun rambu'''. It is a fern in the family Ophioglossaceae, and is the type species of the genus ''Ophioderma''. It is most noteworthy for the length of its pendant fronds,  up to 14 ft 9 in (4.5 meters) in length and three inches (8 cm) wide produced at intervals along a tree-clinging rhizome. ''Ophioderma pendulum'' is a common epiphyte in the East Indies.
Taxonomy Linnaeus was the first to describe this species with the binomial ''Ophioglossum pendulum'' in his ''Species Plantarum'' of 1753.
References