Dendrobium lineale is a species of orchid. It is an epiphytic plant that grows along the north-eastern coast of New Guinea, from Milne Bay to just over the border into the Indonesian Province of Papua (formerly called Irian Jaya), and from sea level to around 800 metres (2,600 ft). It has cane-like pseudobulbs which grow up to 2 metres (6 ft 7 in) long and 2–3 centimetres (0.8–1.2 in) in diameter. Its inflorescences are up to 75 cm (30 in) long with many flowers, up to 5 cm (2.0 in) across. Its leaves are oblong or lanceolate, and up to 15 cm (6 in) long. They last two to three months and bloom throughout the year in the native habitat.