Bogor Botanical Gardens
Danser based his description on the specimen collected in 1917, "Bünnemeijer 938". It consists of a portion of a climbing stem with upper pitchers. The specimen is deposited at the Bogor Botanical Gardens (formerly the Herbarium of the Buitenzorg Botanic Gardens) in Java and Herbarium Lugduno-Batavum in Leiden, Netherlands. "Bünnemeijer 938" was later designated as the lectotype of "N. dubia" by Matthew Jebb and Martin Cheek.