Dendrobium araneum J.J.Sm., Repert. Spec. Nov. Regni Veg. 12 (1913) 397; Nova Guinea 12, 4 (1916) 299, t. 109, fig. 194.
Type: Janowsky 178 (holo BO, iso L).
Stems elongated, pendulous, branching, laterally compressed, 40 cm long, internodes 0.75-0.8 cm long. Leaf sheaths laterally compressed, apex strongly oblique. Leaves overlapping, erect-patent, laterally compressed, slightly recurved, linear-lanceolate, 4.4 by 0.47 cm, coriaceous-carnose, apex acute. Inflorescences axillary, branching, very short. Ovary 0.18 cm long. Flowers c. 0.8 cm long. Dorsal sepal 0.36 cm by 2 mm; mentum conical, 0.36 cm long, truncate, slightly retuse. Petals 0.27 cm by 1.2 mm, apex acutely apiculate. Lip when flattened 0.57 by 0.24 cm, inside minutely papillose-ciliolate. Column 0.16 cm long; column-foot 0.36 cm long, at the apex on either side with a small callosity.
(after Smith, 1916).
Colours: Flower white, lip green.
Habitat: Epiphyte in riverine forest. Altitude not recorded.
Flowering time in the wild: July.
Distribution: New Guinea (endemic).
Distribution in New Guinea: Papua (Nabire Regency).
Cultivation: Probably warm growing epiphyte.