Usually epiphytic, stems 5-15 cm long, 2.5 cm diam.; leaf scars 2.5 cm wide; roots numerous, thick, descending; cataphylls coriaceous. 12 cm long, rounded at apex with subapical apiculum, ca. 3 mm long, drying reddish-brown (B & K Yellow-red 5/7.5) usually persisting as fibers around stem. LEAVES with petioles spreading to erect, (6.5)22-75(99) cm long, 5-15 mm diam., usually D-shaped, sometimes subterete, broadly sulcate, the margins acute; geniculum 1.5-3 cm long (sometimes tinged with red in larger plants); blades triangular to ovate, subcoriaceous, gradually to abruptly acuminate at apex, broadly to deeply lobed at base, 12-55 cm long, 7-30 cm wide, broadest at base; the anterior lobe 11-40 cm long; posterior lobes 5.5-18.5 cm long, usually directed upward; the sinus rarely arcuate, usually hippocrepiform or spathulate, rounded at apex; the upper surface semiglossy to glossy, the lower surface semiglossy; the midrib broadly raised at base above, acutely raised to middle, sunken at apex, convexly raised below; basal veins 3-7 pairs, the fourth to seventh coalesced 1-5.5 cm, raised above and below; the posterior ribs naked, the outer margin rolled up; primary lateral veins 6-11 per side, departing the midrib at 45°-60° angle; weakly sunken above, raised below, straight to the collective vein; lesser veins sunken above, raised below; collective vein arising from the first basal vein, sunken above, raised below, 5-14 mm from margin. INFLORESCENCE spreading, shorter than or equalling leaves; peduncle 17-49(65) cm long, 3-8 mm diam., terete to weakly ribbed, shorter than petioles; spathe subcoriaceous, yellow-green to medium green, tinged with red-violet (B & K. Yellow-green 6/7.5 to 5/10), narrowly ovate to lanceolate, 6-8.5 cm long, 1.5-2.7 cm wide, broadest just above point of attachment, caudate-acuminate at apex, round to cordate at base, inserted at 90° angle on peduncle; stipe 2.5 cm long, 4 mm diam., yellow to medium green; spadix green tinged with purple, deep purple or brown, 4-20 cm long, 5-11 mm diam. at base, 4-8 mm diam. at apex; flowers rhombic to sub-4-lobed, 2.5-4.2 mm long, 2.6-4 mm wide, the sides straight to sigmoid; 5-9 flowers visible in the principal spiral, 5-6 flowers visible in the alternate spiral; tepals matte with pale punctations, minutely and densely papillate, droplets sparse; lateral tepals 1.5-2.5 mm wide, the inner margins convex to straight and turned up against pistil; pistils weakly emergent, green; stigma linear, 0.5-0.7 mm long; stamens developing promptly from the base, the full complement developed promptly, the leading stamens preceding alternates only by 2 or 3 spirals; anthers cream to tan, 0.2 mm long, 0.5 mm wide, exserted on short, transparent filaments, quickly retracting; thecae oblong-ellipsoid, slightly divaricate; pollen yellow to cream, fading to white. INFRUCTESCENCE pendent; spadix to 20 cm long, to 2 cm diam.; berries oblong to obtusely triangular, truncate and usually broadest at apex, medium orange (B & K Yellow-red 7/2.5), 10-13 mm in both directions; mesocarp firm, thick with few raphide cells; seeds 1-2, pale greenish-white, weakly flattened, ± reniform, 5-7.5 mm long, 4-6 mm wide, 3-4 mm thick, minutely appendaged at both ends.