Philodendron fosteri Croat

Vine; stems elongated; internodes drying yellow-brown, with prominent ridges, the surface smooth, greenish yellow, moderately glossy; internodes longer than broad, 6.5-14.5 cm long, drying 5-6 mm diam.; cataphylls green, slender, deciduous. LEAVES scattered along stem; petioles erect-spreading, subterete, 9-10.6 cm long, drying ca. 2 mm diam., gray-green, sheathed to less than 1 cm (to 2.5 cm long when subtending inflorescence); blades narrowly oblanceolate, 20.5-22.0 cm long, 6-6.4 cm wide, 3.4 times longer than wide, 2.3 times longer than petioles, drying yellowish gray-green above, moderately paler and gray-green below, abruptly and narrowly acuminate; midrib drying broadly rounded and finely ribbed, pale short-lineate, concolorous above, paler and finely ribbed below; primary lateral veins 6-7 pairs, arising at a 60° angle (1 directly from the base), drying concolorous, moderately obscure above, finely ribbed and lighter than blade below. INFLORESCENCES 1 per axil; peduncle nearly as long as spathe, pale green, ca. 8.2 cm long, drying 3 mm diam.; spathe pale green outside, ca. 9.3 cm long, ca. 1.1 cm diam. upon drying, flattening to 2.3 cm wide; spadix 9.8 cm long; staminate spadix 6.3 cm long, 4 mm diam. at base, 5 mm diam. toward apex; sterile staminate portion 6 mm diam., 3-5 mm long; pistillate portion greenish, 3.8 cm long, 4.8 mm diam. at base, 7 mm diam. midway, 5 mm diam. at apex; pistils 1.6-2 mm long, 1-1.2 mm diam.; style broadly flattened, irregularly 5- to 6-sided, densely granular, 1-1.6 mm diam.; stigma funnel-shaped with a prominently donut-shaped margin, 0.15 mm diam., 0.2-0.3 mm thick; ovary oblong-elliptic, 4-locular; ovules 1 per locule, 1.3 mm long, 0.2 mm diam.