Anthurium holm-nielsenii Croat

Epiphytic, occasionally terrestrial; stem 1.5-3.5 cm diam.; leaf scars 1.5-1.7 cm high, 2.2-2.5 cm wide; roots dense, descending, pale, moderately elongate; cataphylls coriaceous, lanceolate, 17-25 cm long, narrowly acute at apex, drying light brown to tan, persisting as linear fibers at the apex of the stem. LEAVES spreading; petioles (18)24-47 cm long, 7-12 mm diam., sharply D-shaped and slightly thicker than broad, broadly convex to weakly ribbed medially adaxially, the margins sharply raised to winged, rounded abaxially; geniculum thicker and paler than petiole, becoming fissured transversely with age, 1-3 cm long; blades coriaceous, oblong-oblanceolate to oblanceolate-elliptic, long-acuminate at apex, narrowly acute at base, (50)76- 98.5 cm long, (11)13-27 cm wide, the margins broadly undulate; upper surface matte to semiglossy, dark green, lower surface semiglossy to glossy, slightly paler; both surfaces drying concolorous, green to yellowish; midrib above prominently convex and paler than surface, below thicker than broad at base of the blade, becoming prominently convex toward the apex and paler than surface; primary lateral veins numerous, to more than 20 per side, departing midrib at 45-60° angle, ± straight to the collective vein, moderately obscure, weakly sunken to raised above, darker than surface and weakly raised below; interprimary veins almost as conspicuous as primary lateral veins, numerous; tertiary veins obscure, raised on drying; collective vein arising from near the base, weakly sunken above, equally as prominent as primary lateral veins on drying and when fresh, 5-25 mm from margin. INFLORESCENCES spreading; 24-64 cm long, 3-6 mm diam., 1.4-2(3.4) x as long as petiole, green tinged with purple, terete; spathe erect to spreading, subcoriaceous, green, sometimes heavily tinged purplish or red, broadly lanceolate to oblong-lanceolate, 6-17.5 cm long, 1.5-2.7 cm wide, broadest near the base, acuminate at apex (the acumen inrolled), acute to obtuse at base; stipe 1-2.2 cm long in front, 1-2 mm long in back; spadix green (B & K yellow-green 5/5), also reported as brownish, long-tapered, subsessile, straight to prominently curved, 9-20.5 cm long, 6-9 mm diam. near base, 3-4 mm diam. near apex; flowers square, 2.3-2.7 mm in both directions, the sides smoothly to jaggedly sigmoid; 7-8 flowers visible in principal spiral, 4-5 in alternate spiral; tepals matte, densely and minutely papillate; lateral tepals 1.2-1.4 mm wide, the inner margins straight, the outer margins 2-4-sided; pistils slightly raised, minutely papillate, green; stigma linear, 0.4-0.5 mm long, the laterals preceding the alternates by 8-9 spirals, the 3rd stamen preceding the 4th by 1-3 spirals; filaments fleshy, translucent, somewhat flattened, 0.7-0.8 mm wide; anthers dark yellow, 0.6- 0.8 mm long, 0.6-0.9 mm wide; thecae oblong-ovoid, not divaricate; pollen orange. INFRUCTESCENCE with the spathe persisting; spadix 16.8-31 cm long, 1.4-2.3 cm diam.; berries orange, oblong-ovoid, slightly beaked, 6.5-7.4 mm long, 4-4.5 mm diam.; pericarp somewhat thickened, with linear raphide cells; mesocarp transparent, gelatinous; seeds 1-2 per berry, yellowish brown when dried, oblong, sometimes ovoid, 3.5-4.7 mm long, 2.3-2.7 mm diam., 1.6-2 mm thick, with a gelatinous, sticky appendage at both ends.