Philodendron kaieteurense Croat

Epiphytic or on large sandstone boulders; internodes short, to 3.0 cm diam.; cataphylls 8-10 cm long, bluntly 2-ribbed, pale green, persisting as red-brown fibers with fragments of epidermis; petioles 7.5-17.5 cm long, somewhat spongy, obtusely D-shaped, broadly sulcate to narrowly or obtusely sulcate adaxially, medium green, matte to weakly glossy, finely striate with purple spots around the circumference on the sides and abaxial surface, drying dark brown, matte; geniculum not apparent. LEAVES with blades oblong-elliptic, oblong-lanceolate to rarely subcordate, 36.2-45.5 cm long, 11.5-16 cm wide, 2.8-3.4 times longer than broad, 2.5-4.8 times longer than petioles, slightly inequilateral (one side to ca. 1 cm wider), acute to rounded or weakly subcordate at base, subcoriaceous, dark green and semiglossy above, moderately paler and glossy below, medium green or rarely heavily tinged violet-purple (if so the major veins medium green) below, drying dark brown & matte to weakly glossy above, grayish brown and semiglossy below; midrib narrowly and obtusely sunken medially, somewhat discolored along its margins above, narrowly rounded and paler below, drying slightly darker than surface above, moderately darker and matte below; primary lateral veins 5-7, arising at a steep angle then spreading at 35°-45°, obtusely sunken and concolorous, weakly quilted above, narrowly rounded and paler to concolorous below, drying concolorous and sometimes undulate above, much darker and weakly raised below; basal veins 1-2: minor veins weakly etched and concolorous above, scarcely raised and moderately distinct and rather widely spaced below; upper surface drying smooth above, sparsely very short-lineate above, smooth below, lacking pale lineations. INFLORESCENCES 1-2 per axil; peduncle to 7 cm long, 1.2cm x 9 mm wide; spathe medium green, faintly tinged reddish in distil 3 cm, densely and faintly pale-speckled-lineate throughout outside, pale green and glossy throughout inside, 13.3 long and 2.3-2.8 cm diam.; spadix 11-12.8 cm long; pistillate portion pale yellow-brown, oxidizing black, 2.0-2.7 cm long in back, 2.5-3.6 cm long in front; staminate portion (6.4-)7.9-8.7 cm long, 1.7 cm diam. on broadest part, 1.4-1.5 cm diam. at constriction; sterile portion creamy tan 1.1-2.7 cm long, 1.6-1.8 cm diam., becoming cloudy gray with smaller flowers in distal 3-6 mm in age, those in the lower portion often elongated in the direction of the axis; fertile staminate portion spadix aging dark yellow-brown or sometimes grayish yellow-brown, 2-2.3 cm long, 1.2-1.3 cm diam., frequently very sticky; the apical portion of the staminate spadix an appendix narrowly to rather broadly rounded at apex, 2-3.4 cm long, 2.4-2.5 cm diam., aging creamy gray and clearly demarcated from the rest of the spadix, usually markedly irregular at the base and raised, thicker than the rest of the spadix; pistils 5-6-locular, ovules ca. 1 mm long, attached near the base with funicles as long as or longer than the ovules.