wings may be reduced to ribs in some plants. The glandular region on the inner surface is restricted to the ovate portion of the pitcher cup. The glands are small (0.2–0.3 mm in diameter) and occur at a density of around 150–180 per square centimetre. The waxy zone is well developed and eye spots may occasionally be present on the rear inner surface, visible through the opening. The peristome is sub-cylindrical to cylindrical and up to 4 mm wide. It bears ribs up to 0.1 mm high and spaced 0.2 mm apart, which terminate in teeth up to 0.4 mm long. The inner portion of the peristome accounts for around 51% of its total cross-sectional surface length. The pitcher lid or operculum is ovate and has a cordate base. It measures up to 3 cm in length by 2.5 cm in width and does not bear any appendages. The underside of the lid has an even distribution of small (0.1–0.2 mm in diameter) convex glands, occurring at a density of about 40/cm2. The spur, which is inserted near the base of the lid, is up to 7 mm long and may be simple, forked, or fasciculate with up to 12 branches. Upper pitchers are ovate in their basal third to fifth, becoming cylindrical above and infundibular towards the peristome. They are smaller than their lower counterparts, reaching only 8 cm in height by 2 cm in width. Wings are always reduced to ribs. In other respects, upper pitchers are similar to the lower traps. Nepenthes mikei has a racemose inflorescence measuring up to 18 cm in length by 1.8 cm in diameter. The peduncle itself may be up to 8 cm long by 1 mm wide in female plants, and up to 3 cm long in males. The rachis is up to 8 cm long. The inflorescence bears one-flowered pedicels (≤6 mm long), which may be bracteoleate. The oblong-lanceolate tepals measure up to 4 mm in length. Fruits are up to 22 mm long. Most parts of the plant are glabrous. An indumentum of short, white or yellowish hairs is usually present on the tendrils and some parts of the inflorescence. This indumentum is a mixture of simple and stellate hairs. Caducous hairs cover developing pitchers and other parts. Ecology Nepenthes mikei is endemic to the Indonesian island of Sumatra, where it has been recorded from only two mountains: Mount