Rhaphidophora tenuis – of Kalimantan/Borneo – around 1000m ASL.

In taxonomic literature, R. tenuis was at times treated as a synonym of Rhaphidophora korthalsii; in 2006, Peter C. Boyce reclassified the species as a separate clade and stated that it was endemic to Sarawak and Brunei. According to Boyce, it is a moderately slender, heterophyllous liana growing to about 5 m; the juvenile ‘shingling’ stage bears ascending, strongly sickle-shaped lanceolate leaves, adult leaves are pinnate to pinnatifid with very narrow pinnae (up to about 2 cm), and the inflorescence is typically solitary. Its habitat is described as primary to disturbed secondary lowland and hill forests (approx. 20–1000 m); the species grows on trees and rocks and has been observed on various substrates, including limestone. The genus name Rhaphidophora is derived from the ancient Greek rhaphis (‘needle’) and -phoros (“bearing”); the species epithet tenuis means ‘thin/slender’ in botanical Latin.