The pitchers of "N. macrophylla" are robust and almost woody in texture. Rosette and lower pitchers are shortly cylindrical in shape, becoming narrower around the midpoint. They can be very large: up to 35 cm high by 15 cm wide. A pair of fringed wings (≤10 mm wide) runs down the ventral surface of the pitcher. Terrestrial pitchers usually have a hip in their lower half. The pitcher mouth is and has an oblique insertion. The peristome is cylindrical and expanded, measuring up to 15 mm wide. It bears a series of highly developed ribs, which terminate in prominent downward-pointing teeth. The pitcher lid or operculum is ovate, very broad, and has a base. An unbranched spur (≤9 mm long) is inserted near the base of the lid. Upper pitchers are similar to their lower counterparts in most respects. They differ in having a more cylindrical shape, reduced wings, and the hip always being located in the upper half. Traps may have a range of colours, although the yellow-pitchered form is more common than the red-pitchered form.