Bulbophyllum hoyifolium J.J.Verm., Blumea 38 (1993) 150, fig. 8
Type: Leiden cult. (Schuiteman, Mulder & Vogel 90-460) 31865 (holo L, alc. only)
Roots along the entire rhizome. Rhizome 0.8-1.2 mm diam., sections between pseudobulbs 4-19 cm long, bract fibres hardly persistent. Pseudobulbs distant, cylindrical, slightly swollen towards the tip or not, somewhat flattened, 1-1.5 by 0.16-0.22 cm. Petiole 0.3-0.5 cm. Leaf blade elliptic to ovate, 6-10 by 1.2-3.4 cm, index (length/width) 2.5-5; acuminate. Inflorescence erect to patent, 5-11 cm long, 1-flowered. Peduncle 3.4-8.5 cm, bracts c. 4, the longest 3.5-5.5 mm long. Floral bracts ovate, 3.5-4.2 by 2-4 mm, acute. Flowers resupinate, moderately opening. Pedicel and ovary 9-15 mm long, basal node on a 0.2-0.8 mm long stump, ovary ribs alternating obtusely angular and angular, all straight. Median sepal recurved, elliptic to ovate, 6-9 by 4-5 mm, index 1.5-1.8; obtuse to acute, margins entire, base rather broadly attached; thin; glabrous. Lateral sepals free, ovate with a tooth along the lower margin, 7-8.5 by 5-6 mm, acute, index 1.3-1.4, base rather narrowly attached, otherwise as the median sepal. Petals recurved, elliptic to ovate, 4.2-6 by 2.5-3.6 mm, index 1.3-1.4; acute to acuminate, margins entire, base rather broadly attached; thin, glabrous. Lip recurved, subtriangular, 2.8-4 by 2-4 mm, index 0.9-1.4 (all without artificial spreading); rounded, thick, glabrous; adaxially slightly concave near the base, convex and slightly furrowed towards the tip; abaxially with a weak, retuse median ridge from the base to almost to the tip. Column 1.4-1.8 mm long, stigma inside with three keels, at its base without teeth, column foot with a small, flat, obtuse tooth just above the ligament. Stelidia deltoid to triangular, 0.2-0.3 mm, obtuse to acute, sometimes with a slightly erose upper margin, and always with a large, downwards pointing, triangular, obtuse tooth along the lower margin, about half-way the column. Anther abaxially slightly colliculate and with an inconspicuous, rounded crest; front margin somewhat drawn out, erose. (After Vermeulen, ms.)
Colours: Median sepal and petals green, lateral sepals white; all with reddish purple veins towards the base. Lip reddish purple, or whitish, suffused with reddish purple. Column whitish, anther yellow.
Habitat: Epiphyte in lower montane forest; 900-1000 m.
Flowering time in the wild: November.
Distribution: Malesia (New Guinea).
Distribution in New Guinea: Papua New Guinea; see map 96-827M.jpg.
Cultivation: Intermediate growing epiphyte, requires shaded position.