Philodendron gribianum Croat

Epiphytic creeper; stems 4-5 cm diam.; internodes ca. 4 cm long; cataphylls soft, lacking a prominent rib, faintly reddish, deciduous; petioles moderately firm, terete, drying 11.6-31.7 cm long, 5-12 mm diam., medium reddish brown to dark reddish brown; preadult blades broadly ovate, 17.4-23.7 cm long, 12-17.1 cm wide, the sinus ca. 1 cm deep, narrowly rounded at the apex; adult blades broadly ovate-cordate, 38.5-42.1 cm long, 35.5-42.1cm wide (averaging 40 x 39), 0.9-1.2 (averaging 1.05) times longer than broad, broadest above petiole attachment, 2.3 times long as petioles, abruptly acuminate at apex, (acumen to 1.6 cm long), prominently lobed at base, dark lustrous green, moderately bicolorous, drying olive-brown and semiglossy above, reddish medium brown and semiglossy below; upper surface minutely scattered pustular; lower surface minutely and irregularly ridged (including on the veins); anterior lobe 30.2-32.7 cm long, with straight margins, the distal margin broadly rounded; posterior lobes 14.4-15.5 cm long, 12.2-14.7 cm wide, directed downward and inward; midrib slightly paler than surface above, drying flattened, finely ribbed and darker above, flattened, with irregularly short wing-like ridges and slightly paler below; primary lateral veins 8 pairs, arising at a 50-55° angle near middle, drying flattened and concolorous above, narrowly raised to narrowly acute with irregularly short wing-like ridges and slightly darker below; minor veins indistinct, arising mostly from midrib but also from the primary lateral veins closer to margins, drying moderately visible and distinct above and below; laticifers sometimes etched in upper surface, moderately conspicuous and close together, near veins below; basal veins 5 pairs, all free to base, 2nd and 3rd pairs coalesced to 2 cm; sinus parabolic, 8-9 cm deep, 2.8 cm wide at middle. INFLORESCENCES up to 5 per axil; peduncle 13-16.6 cm long; spathe green throughout, 11.5-15.7 cm long, to 1.7-2.4 cm wide, drying coriaceous, medium reddish brown to dark reddish brown; spadix 11.1-13.1 cm long, drying medium brown, staminate portion bluntly pointed at apex, 4.8 cm long, 8 mm diam. in distal 2/3, 6 mm diam. at 1 cm from apex; sterile staminate portion 3-5 mm long, 5 mm diam.; pistillate portion 6.5 cm long, pale green, 6 mm diam. at apex, 1.2 cm diam. midway, 1.3 cm diam. nearer the base, pistils obovoid and mammiliform at apex, the style and stigma together more than 1.5 mm long; style drying thin but somewhat coriaceous, with the margin thin; stigma 0.6-0.7 mm wide, ca. 0.1 mm thick; locules 4, ovules 1 per locule, 1.4 mm long, 0.2 mm wide, basifixed, enveloped in a gelatinous matrix, funicle 0.3 mm long, densely glandular, the base of the ovule proper with a dark spot.