Epiphytic or epilithic; sap white; internodes slightly longer than broad, ca. 2 cm diam., semiglossy, epidermis light brown, drying conspicuously wrinkled and folded into sharp, irregular ridges; roots 3--4 mm diam, drying reddish brown with prominent ridges, semiglossy, with thin broad scales; cataphylls not seen, probably deciduous; LEAVES: petioles 36.5 cm long, 4 mm diam., terete; blades ovate, acute at apex (the acumen more or less inrolled, 5 mm long), cordate at base, 33 cm long, 21 cm wide (1.5 times longer than wide), (0.9 times the petiole length), slightly shorter petioles, margins sinuate, upper surface drying gray-green, lower surface paler, drying yellow-green; anterior lobe 24.6 cm long, 21 cm wide (1.2 times longer than wide); posterior lobes 9 cm long, 9.5 cm wide, rounded, directed toward base; sinus 7-8 cm deep; midrib convex and concolorous above, convex and paler, drying yellowish, closely fissured and minutely warty below; basal veins 3 per side, with 1 free to base, 1 coalesced, second and third veins coalesced 1.9 cm; posterior rib not naked; primary lateral veins 5 per side, departing midrib at a 50--60(75)º angle; minor veins moderately distinct, arising from both the midrib and primary lateral veins. INFLORESCENCES 1 per axil; peduncle 7 cm long, 5 mm diam.; spathe 9.5 cm long (1.3 times longer than peduncle), visibly constricted above the tube, elliptic and to 5.5 cm wide when flattened, green throughout, green, drying reddish brown within; spathe tube ca. 4 cm long; spadix sessile; 7.2 cm long, broadest more or less uniform throughout; pistillate portion cylindrical, 1.3 cm long, 1 cm diam.; staminate portion 6 cm long; fertile staminate portion cylindrical, 1 cm diam., broader than the pistillate portion, sterile staminate portion not detectable; pistils 1.1 mm long, 0.6 mm diam.; ovary 7--8-locular, 0.6 mm diam., with basal placentation; ovules 1 per locule, 0.1 mm long, more or less equal in length to funicle, style 0.6--0.8 mm diam., similar to style type D; style apex more or less flat, with style boss; stigma subdiscoid, unlobed, 0.7--1.1 mm diam., 0.1 mm high, covering interior faces of stylar funnel; the androecium truncate, margins 4-6-sided; thecae oblong, very elongated, 0.2 mm wide.