Dendrobium disoides Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 641; 21 (1928) t. 216, fig. 816.
Type: Schlechter 17118 (holo B, lost; iso AD, AMES, BO 2x, E, G, K, L 3x, MO, NSW, S).
Rhizome stem-like, decumbent, roots elongated, filiform, flexuose, glabrous. Stems erect to patent, sometimes rooting, not or sparsely branched, to 35 cm by 1.25-1.75 mm, densely many-leaved. Leaf sheaths 0.12-0.17 cm wide, entirely covering the stem. Leaves erect-patent, ligulate to oblong-ligulate, 1-1.8 by 0.27-0.35 cm, apex unequally obtusely bilobulate, carnose, shiny. Inflorescences arising laterally from the stem, 1-flowered, sessile. Pedicel and ovary 0.7 cm long, glabrous. Flower not resupinated, c. 0.7 cm long. Dorsal sepal oblong, 0.5 cm long, apex obtuse. Lateral sepals falcate, obliquely oblong, sublobate-widened at the base, 0.5 cm long, apex apiculate; front margins coherent to just below the apex; mentum spur-like, oblongoid-cylindrical, 0.25 cm long, obtuse. Petals obliquely elliptic-spathulate, a little shorter than the sepals, apex obtuse. Lip 3-lobed near the apex, with a ligulate claw, in apical half strongly widened, 0.45 by 0.3 cm, inside in the centre pilose, with two high lamellae extending from the middle to just below the apex; lateral lobes divergent, obliquely ovate, subfalcate, short-acuminate; midlobe longer, semioblong, narrowed at the apex, obtuse. Column short, clinandrium 3-lobulate, the lateral lobules rounded, the median longer, obtuse; column-foot ligulate, 0.25 cm long. Anther subquadrangular-cucullate, weakly umbonate, in front subretuse, glabrous.
(after Schlechter, 1912).
Colours: Flower white, lip near the apex with red dots.
Habitat: Epiphyte in lower montane forest. Altitude 1000 m.
Flowering time in the wild: January.
Distribution: New Guinea (endemic).
Distribution in New Guinea: Papua New Guinea (Madang Province: Kani Mountains).
Cultivation: Intermediate growing epiphyte.