Epiphytic or hemiepiphytic; stem appressed-climbing, elongate, sap chalk-white; internodes short, 4-9 cm long on lower stems, short on flowering plants, 1-3 cm diam., as broad as long or slightly longer than broad, gray-green; roots drying dark brown, few per node; cataphylls thin, membranous, 23-42 cm long, bluntly 1-ribbed, green, drying pale yellowish brown, persisting as pale fibers; LEAVES: petioles 10.5-23.5 cm long, 3-6 mm diam., medium green, semiglossy, bluntly and broadly or deeply and narrowly sulcate adaxially, with adaxial margins obtuse or sometimes acute; blades linear to oblanceolate, chartaceous to weakly subcoriaceous, weakly bicolorous, drying greenish to yellowish brown on both surfaces, matte and paler below, acuminate to weakly acute at apex (the acumen apiculate), attenuate at base, 29-84.5 cm long, 5-12 cm wide (5.1-8.3 times longer than wide), (2.6-4.7 times longer than petiole), much longer petioles, broadest in upper one-third; midrib prominently and narrowly sunken above, thicker than broad, bluntly acute, glossy and darker than surface below; basal veins lacking; primary lateral veins 6-9 per side, departing midrib at a 25-45º angle, straight to weakly arcuate to the margins, sunken above, convex below; interprimary veins sunken above, slightly raised below; minor veins arising from midrib only; tertiary veins visible, darker than surface below. INFLORESCENCES 1-3 per axil; peduncle (2.5)4-8.9 cm long, ca. 10 mm diam., drying 3-5 mm diam., shorter than petiole, subterete or irregularly angled, white-striate; spathe subcoriaceous, semiglossy, 9-13.5 cm long, (1.8-3.3 times longer than peduncle), moderately constricted midway or just below the middle, abruptly acuminate at apex; spathe blade lanceolate, pale green to greenish white outside, 5.5-8 cm long, greenish white inside; spathe tube ellipsoid, green, short white lineate outside, 3.5-5.5 cm long, 1.8-2 cm diam., white (at anthesis) inside; spadix stipitate to 5 mm long; 11-15 cm long; pistillate portion white to pale greenish, weakly ellipsoid, 3-3.5 cm long; staminate portion 4.5-7.8 cm long; fertile staminate portion white; sterile staminate portion 1.2 cm diam.; pistils 0.6-0.9 mm long, 3 mm diam., drying blackish; ovary 4-locular, with axile placentation; ovules ca. 20 per locule, 2-3-seriate, 0.3-0.4 mm long; funicle ca. 0.4 mm long, adnate to lower part of partition, style similar to style type D; style apex flat, with a small style boss; stigma hemispherical; the androecium oblong, 3-5-sided, 0.8-1.2 mm long, 0.4-0.6 mm diam. at apex; sterile staminate flowers irregularly 4-6-sided, 1.5-2.1 mm long, 0.7-1 mm wide. INFRUCTESCENCE 6 cm long, 2.5 cm diam.; seeds 18-20 per locule, obovoid to weakly ellipsoid, 0.8-1 mm long, 0.4-0.5 mm diam.