to 12 mm wide runs down the ventral surface of the pitcher cup. These wings bear filiform fringe elements up to 10 mm long. The pitcher mouth is oval to circular and up to 6 cm across. It has an oblique insertion and rises at the rear to form a conspicuous neck. The peristome is cylindrical to slightly flattened and up to 2 cm wide for most of its length, becoming broader towards the neck (≤3 cm wide). It bears ribs up to 2 mm high and spaced up to 2 mm apart, which terminate in teeth (≤4 mm long) on the peristome's inner margin. The digestive zone usually covers the entirety of the pitcher's inner surface. The pitcher lid or operculum is elliptic and measures up to 6 cm in length by 4.5 cm in width. It lacks appendages or a keel. A spur is inserted near the base of the lid. It measures up to 9 mm in length, with a basal diameter of up to 2 mm, although it may be much smaller. Upper pitchers are frequently produced. They are variably funnel-shaped, ranging from wholly infundibular to infundibular only in the basal two-thirds and cylindrical above. They may be somewhat larger than their terrestrial counterparts, reaching 25 cm in height by 7 cm in width, though they rarely reach these maximum dimensions. The wings are commonly reduced to a pair of ribs. Aerial traps resemble terrestrial ones in other respects. Nepenthes gantungensis is known to flower both in the rosette stage and as a vining plant. The species has a racemose inflorescence. Male inflorescences can reach a height of 60 cm, of which the rachis constitutes up to 30 cm. Female inflorescences are similar in size, growing to 50 cm in length. Peduncles of both sexes have a basal diameter of approximately 1 cm. Female inflorescences hold up to around 150 closely packed flowers that are usually restricted to the distal quarter of their length. Flowers are most commonly borne entirely on one-flowered pedicels, but some plants may have a combination of these and two-flowered partial peduncles. Fruits are up to 8 mm long. As in most Nepenthes species, the seeds are filiform. They are pale brown and measure around 7 mm in length. A dense indumentum of simple, reddish-brown hairs (≤3 mm long) is present on the undersides of the tendrils. These hairs are caducous, being