Epiphytic; stem scandent; leaf scars inconspicuous; internodes terete, 5--6.5 cm long, 4--5 mm diam., much longer than broad, drying yellowish brown, epidermis fissured narrowly; roots dark brown, drying moderately fuzzy, slender, 1 mm diam., very few per node; cataphylls weakly to sharply 2-ribbed, glossy, deciduous; LEAVES: petioles 9--11 cm long, to 4 mm diam., narrowly and obtusely sulcate adaxially, surface minutely wrinkled; sheath conspicuous, the tip free-ending (2--3 mm long); blades ovate, acuminate at apex (acumen inrolled, 1--2 mm long), weakly subcordate at base, 9.8--11 cm long, 7--8 cm wide (1--1.4 times longer than wide; about equal in length to petiole), broadest in lower one-third, margins revolute, drying reddish brown, upper surface medium green, drying grayish green, semiglossy, lower surface weakly glossy, moderately paler, drying yellowish green; anterior lobe 9--10.5 cm long, 7--8 cm wide (5.9--7.1 times longer than posterior lobes), broadest in lower one-third; posterior lobes 2--2.4 cm long, 2.8 cm wide, rounded; sinus obtusely angular, 5 mm deep; posterior rib lacking; midrib concave above, moderately raised, drying paler than surface below; basal veins numerous on each side but none of them outstanding, primary lateral veins lacking or indistinguishable from minor veins; minor veins close, arising from the midrib only, arising from both the midrib and primary lateral veins. INFLORESCENCES 1 per axil; peduncle 4.7 cm long, 3.5 mm diam., dark brown; spathe erect, subcoriaceous, 9--9.3 cm long, (2.1 times longer than peduncle), maroon throughout on both surfaces; spathe blade 6.9 cm long; spathe tube 4.5 cm long, spadix green throughout (probably juvenile), narrowly rounded at apex, 7.3 cm long, constricted below sterile staminate portion; pistillate portion drying grayish, slightly tapered toward the apex, 2.1--2.5 cm long in front, 1.2 cm long in back, 4.5--5 mm diam. at apex, 5--6.8 mm diam. at middle; staminate portion 4.5--6.1 cm long; fertile staminate portion white, gradually tapered towards apex, 6.5--6.8 mm diam.; pistils 1.1 mm long; ovary 5-locular, 0.9 mm diam., ovule sac ca. 0.5 mm long, with sub-basal placentation; ovules 2 per locule, contained within transparent ovule sac, ca. 0.2--0.3 mm long, longer than funicle; funicle 0.1--0.2 mm long (can be pulled free to base), style 0.7--0.9 mm diam., similar to style type D; style apex rounded; style boss broadly and gently rounded; stigma button-like, distinctly lobed, 1 mm diam., 0.3 mm high, covering entire style apex, inserted on style boss; the androecium truncate, prismatic, margins irregularly 4--6-sided, 0.9--1.1 mm long, 3--5 mm diam. at apex; thecae oblong to weakly ellipical, 0.4 mm wide, more or less parallel to one another; sterile staminate flowers subrounded, 5--9 mm wide, grayish to pale orange.