Appressed epiphyte, climber, or sometimes terrestrial; juvenile plants with petioles 14-18 cm long, 1-2 mm diam.; blades triangular-ovate, cordate, 10-16 cm long, 4-8 cm wide; adults with internodes 3-10 cm long, 2-3.7 cm diam., medium green to gray-green, eventually turning brownish, semiglossy, becoming densely transversely fissured; cataphylls mushy at upper nodes, persisting as the basal portion of pale fibers or deciduous, drying reddish brown; petioles (37)43-86 cm long (averaging 56.1 cm), drying 6-11 mm diam., erect-spreading, terete or obscurely and narrowly sulcate, medium green, semiglossy; blades ovate-cordate, acuminate at apex, 35-84 cm long, 23-44 cm wide (averaging 53 X 32 cm), 1.4-1.9 times longer than broad, .7-1.3 times longer than the petioles, broadest just above point of petiole attachment, subcoriaceous, convex at margins; lower surface slightly to moderately paler, matte to weakly glossy, drying light to medium olive above, lighter, often with a golden sheen below; anterior lobe 24-64 cm long; posterior lobes 12-23 cm long, 9-18 cm wide, directed inward; sinus spathulate, 10-18 cm deep, 2-5(8) cm wide; upper surface dark green, matte with a velvety sheen; midrib acute and slightly paler above, convex or narrowly rounded, paler and weakly ridged below; basal veins 6-8 pair, raised on both surfaces, at least upon drying, the first 2 or 3 free to base, the remainder coalesced for 2-7 cm; posterior rib naked for 2-6 cm <along most of length); primary lateral veins 8-15 per side, departing midrib at 45°-60° angles, ascending to the collective vein, acutely and prominently raised and slightly paler above, narrowly to acutely raised and often slightly paler below; tertiary veins in part sunken above, raised below; collective vein usually arising from one of lowermost basal veins, as prominent as the primary lateral veins, 2-5 mm from margin; INFLORESCENCES erect; peduncle 15-35(-75) cm long, 3-7 mm diam.; spathe lanceolate to oblong, light green to medium green, reflexed, semiglossy, 8-12 cm long, 3-4 cm wide; spadix yellow-green to medium green or whitish, semiglossy, slightly tapered to apex, erect to curved, depending upon age, 5-9 cm long, 5-7 mm diam. at base tapered to 4-5 mm diam. at apex; tepals paler and matte at anthesis, turned somewhat upward; pistils early emergent; pollen orange. INFRUCTESCENCES 19-22 cm long, 15-16 cm diam. at base tapered to 12-14 cm diam. at apex.