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Genus Trachoma

Genus Trachoma

Trachoma Garay, Bot. Mus. Leafl. 23 (1972) 207


  • Genus Parapteroceras Aver., Bot. Zhurn. 75 (1990) 723
  • Genus Tuberolabium Yamamoto, 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.

In New Guinea genus Trachoma contains the following 2 species:

Tuberolabium papuanum
Tuberolabium rhopalorrhachis

Southeast Asia, Malaysia, Indonesia, the Philippines, Papua New Guinea, Australia. About 20 species; in New Guinea about 2 species.

Epiphytes in lowland forest.

  • Subfamily Epidendroideae
  • Tribe Vandeae
  • Subtribe Aeridinae
  • Genus Trachoma

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.

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Genus Trachoma

Trachoma sp., habit, photo N.E.G. Cruttwell (5/90, PNG, Mt. Gahavisuka), perhaps just a colour form of T. rhopalorrhachis

Genus Trachoma

Trachoma rhopalorrhachis (Rchb.f.) Garay, habit, photo A. Schuiteman, based on Leiden cult. 20031895

Genus Trachoma

Trachoma rhopalorrhachis (Rchb.f.) Garay, flowers, photo A. Schuiteman, based on Leiden cult. 20031895

Genus Trachoma

Trachoma rhopalorrhachis (Rchb.f.) Garay, inflorescence, photo E.F. de Vogel, based on Leiden cult. 20031890

Genus Trachoma

Trachoma rhopalorrhachis (Rchb.f.) Garay, habit and floral analysis, drawing N.H.S. Howcroft 7, from Brown River