Bot. Mag. (Tokyo) 38 (1924) 209
Monopodial epiphytes. Stem short to elongated. Leaves few to several, arranged in two rows, sheathing at the base, glabrous, deciduous, duplicate, leathery. Inflorescence lateral, a many-flowered raceme. Flowers either appearing in successive clusters or simultaneously along the whole inflorescence, rather small, ephemeral or not, resupinate. Sepals free. Petals free, somewhat narrower than the sepals. Lip with or without spur, more or less sac-shaped, without callosities, not mobile. Column-foot present or absent. Pollinia 2, entire or with a short slit, solid, caudicles present or absent, stipe present, short, viscidium present.
Southeast Asia, Malaysia, Indonesia, the Philippines, Papua New Guinea, Australia. About 20 species; in New Guinea about 2 species.
Epiphytes in lowland forest.
Members of this genus of small monopodial epiphytes are often called Saccolabium, but as currently understood true species of Saccolabium occur only in Java and Sumatra. Tuberolabium is characterised by the very fleshy, sac-shaped, immobile lip, without callosities or other ornaments inside, and by the two pollinia. Frequently seen in amateur collections.