Hemiepiphytic vine; internodes to 2.5 cm diam., longer than broad, epidermis drying light brown and semiglossy but conspicuously and irregularly folded; roots several per node, drying dark brown; cataphylls deciduous LEAVES: Petioles to 68 cm long, 1.5 cm diam., subterete, somewhat spongy, drying blackened, surface closely and finely ridged; sheathing to 8.5 cm long; blades trisect, subcoriaceous, moderately bicolorous, drying weakly glossy, upper surface dark green, drying dark brown, semiglossy, lower surface drying yellow-green, matte; median segments elliptic, somewhat inequilateral, 39.5 cm long, 15 cm wide (ca. 2.5 times longer than wide), (1.5 times longer than lateral lobes), somewhat acuminate at apex, base attenuate and somewhat inequilateral with leafy tissue extending to base on one side, ending 2.5 cm above the base of the other side; lateral segments markedly inequilateral, 32--32.8 cm long, 12.7--13 cm wide, acuminate; the outermost lobes with the inner margins attenuate, tissue ending 1--2.5 cm from base of petioles; outer margins rounded, barely or not at all naked along the sinus; midrib weakly raised, concolorous above, more or less round-raised, drying blackened and irregularly ridged below; basal veins lacking; primary lateral veins ca. 25 per side, ca. 4--5 mm apart, departing midrib at a 65--70º angle towards apex, 85--100º angle towards base, gradually curved to the margins, weakly sunken, scarcely more conspicuous than interprimaries above, prominently raised below; interprimary veins numerous, 1--3 between each pair of primary lateral veins; minor veins in part undulate upon drying, close, moderately visible, arising from both the midrib and primary lateral veins. INFLORESCENCES (post-anthesis) 1 per axil; peduncle to 22 cm long, 1 cm diam., drying blackened, somewhat spongy; spathe to 20 cm long, ca. 4 cm diam., semiglossy, green outside, red at base inside, drying blackened; pistillate spadix 11.8 cm long, ca. 3 cm diam.; staminate spadix 7.5 cm long, ca. 1 cm diam., moderately tapered to a bluntly acute apex; pistils more or less cylindrical, 3--4 mm long, 2.5 mm diam.; ovary 6--7-locular, with sub-basal placentation; locules 2.3 mm long, 0.5 mm diam.; ovules 1 per locule, contained within a transparent evelope; funicle ca. 0.4 mm long, (can be pulled free to base), style similar to style type D; style apex flat; style boss pronounced but narrow; seeds 1 per locule, 1.4 mm long.