Philodendron effusilobum

Hemiepiphytic appressed climber; stems with internodes 4-7.5 cm long, 1-1.5 cm diam, green, soon turning light brown to tan, sometimes drying irregularly cracked, longitudinally and deeply fissured or with minute, scurfy ridges perpendicular to the axis, sometimes flaking off the stem in large patches; roots usually 6-10 at each node, 15-20 cm long, 2-3 mm diam., drying light brown; cataphylls slender, thin, to 17cm long, promptly deciduous. LEAVES with petioles terete, 21-46 cm long, 4-7 mm diam. midway; blades deeply 3-lobed to within 2-4 cm of the base, 7-25 cm long, 22-35 cm wide at the lateral lobes, subcoriaceous, dark green and semi-glossy above, paler beneath (drying moderately thin, greenish brown to olive-green); medial lobe narrowly oblanceolate to oblanceolate-elliptic, 17-25 cm long, 5-8 cm wide, broadest well above the middle (usually drying folded where joined to the lateral lobes); primary lateral veins 3-4 pairs, obscure above, weakly raised and moderately obscure beneath, arising at 35-45° angle from the midrib and moderately straight to the margins; minor veins obscurely visible on drying; lateral lobes moderately straight or weakly falcate, usually spreading at a 90° angle from the midrib, sometimes slightly arcuate-ascending, 11-19 cm long, 2.9-6.7 cm wide, broadest well beyond the middle, 1.2-2.6 cm wide near the base, narrowly rounded to bluntly acute at the apex, the posterior rib almost straight to weakly curved, 6-9 cm long; lower edge of the lateral lobes lacking any obvious lobe; the first pair of basal veins usually free to the base, 3-5 additional basal veins coalesced to 4.5-8.5 cm from the base, nearly all of these departing toward the upper (distal) half of the lobe (which is usually somewhat broader than the lower half). INFLORESCENCES paired, slender; peduncles 2-3.5 cm long, 3-4 mm diam.; spathe color not reported, presumably green, apparently not at all constricted above the tube; pistillate portion of the spadix 1.7-2.4 cm long, more or less cylindrical, 4-5.5 mm diam.; pistils 0.7 mm long, closely packed (about 20 spirals), the apex irregularly hemispherical, 0.7-1 mm diam., the stigma generally bearing 3-6 pale, wart-like structures, these irregularly spaced but generally crowded together; staminate portion 4.5-5.3 cm long, 6-7 mm diam., cylindroid, weakly tapered to the apex in distal one-third; sterile staminate section not readily apparent, 5-6 mm broad; staminate flowers very irregularly 4-5 sided, 0.4-1 mm diam., truncate at apex. INFRUCTESCENCE not seen.