Dendrobium cylindricum J.J.Sm., Repert. Spec. Nov. Regni Veg. 12 (1913) 117; Nova Guinea 12, 3 (1916) 341, t. 123, fig. 226.
Type: Gjellerup 1082 (holo BO).
Stems elongated, unbranched, angular-terete, in upper part flexuose, 72 cm long, internodes 3.2 cm long, shorter in upper part. Leaf sheaths verruculose. Leaves patent, subovate-lanceolate, 3.5-7.5 by 1-1.2 cm, coriaceous, margins in apical part minutely serrulate-fimbriate, apex obtuse, apiculate. Inflorescences subterminal, racemose, very short; rachis 0.8 cm long, densely c. 9-flowered. Floral bracts triangular, 0.9 by 0.57 cm, apex acuminate, outside sparsely verruculose. Pedicel and ovary 1.75 cm long, clavate. Flowers 2.4 cm long. Dorsal sepal 0.85 cm by 4.5 mm; mentum subcylindrical, 1.4 cm long, obtuse, retuse. Petals 0.83 cm by 2.7 mm. Lip clawed, extending to the apex of the column, cuneate-oblong, when flattened 1.9 by 0.95 cm, claw for 0.95 cm adnate to the column-foot; apex cucullate, plicate, apical margin densely narrowly serrate. Column 0.26 cm long; column-foot 1.35 cm long, just below the apex with a bidentate lamella.
(after Smith, 1916).
Colours: Flower orange.
Habitat: Epiphyte in open mossy montane forest. Altitude 1900 m.
Flowering time in the wild: April.
Distribution: New Guinea (endemic).
Distribution in New Guinea: Papua (Manokwari Regency: Arfak Mountains).
Notes: Dendrobium cylindricum is a 'standard' member of the Calyptrochilus group with few outstanding features.
Cultivation: Cool growing epiphyte.