Appressed-climbing on tree trunks, to at least 15 m. Internodes 1.0-6.9 (-18.5) cm long, (0.3-) 0.5-2.5 cm wide, dark olive-green, weakly glossy, obtusely sulcate on one side, drying yellowish brown to dark brown, coarsely sulcate, the epidermis excoriating; roots present at distal nodes, to ca, 2 mm thick. LEAVES: Petiole (9.7-) 12.4-48.0 cm long, P/L= (0.74-) 0.85-1.16 (-1.41), heavily dark lineate-streaked, sheathed (69-) 83-94 (-96)%, the sheath involute (on juvenile plants) to horizontally spreading, recurred and densely lineate near margins, the free portion prolonged apically to ca. 0.9 cm; unsheathed portion of petiole (0.8-) 1.1-7.2 cm long, D-shaped, sulcate above, the margins obtuse to moderately sharP. Lamina 13,3-42.7 cm long, 6.9-28.4 cm wide, L/W=(1.12-) 1.4-2.09 (-2.27), IQI=0-4 (-6), thinly coriaceous to subcoriaceous, semiglossy both sides, virtually concolorous, broadly elliptic to narrowly or broadly ovate (broadest at or below the middle), acute to abruptly acuminate apically [the acumen 0.7-1.8 (-2.4) cm long], broadly cuneate to truncate (on smaller leaves) or, more usually, subcordate to cordate basally with the sinus 0.6- 1.4 cm deep; midrib flat above, convex and ± paler below; primary lateral veins (5-) 6-9 (-10) per side, (0.4-) 2.2-5.4 (-7.5) cm apart, weakly sunken above, convex and paler below; minor veins visible below and darker; abaxial laminar surface drying moderately and uniformly granular, the reticulate veins usually weakly or not visible; white stitching and resin canals usually visible; adaxial surface moderately to obscurely granular, the reticulate veins obscure at best; white stitching and resin canals sometimes visible, though not typically. INFLORESCENCES solitary or occasionally paired; cataphylls 6.9-17.9 cm long, 0.4-1.6 cm wide, lanceolate, sharply 2-keeled; peduncle (2.7-) 3.7-7.4 (-13.0) cm long, P/S=0.31-0.85, obscured by sheath; spathe at anthesis 10.0-23.5 cm long, 2.9-5.3 cm wide, externally dark green on tube, medium green on blade and margins of tube, pale green to white within; spathe drying moderately and uniformly granular and short-white-lineolate externally, internally densely and conspicuously white-granular, with longitudinal secretory striations to at least 6/7 to apex; acumen of spathe 1.0-2.5 cm long. Stipe of spadix ca. 0.7-1.7 cm long; spadix 8.7-21.2 cm long, the fertile male portion 0.9-1.7 cm wide, creamy-white, deleted slightly forward at anthesis; sterile male zone 0.6-1.3 cm long; female portion of spadix 2.1-4.7 cm long, F/S=0.17-0.31, 1.5-2.1 cm wide, pale green; fertile male flowers 1.8-2.4 mm long, 0.6-1,5 mm wide, irregularly polygonal, columnar; sterile male flowers 1.6-4.0 mm long, 1.3-2.4 mm wide, climate; female flowers 2.3-4.0 mm long, 0.7-1.1 mm wide, the style with conspicuous raphides. INFRUCTESCENCES: Ripe fruits unknown. Seeds unknown.