Disperis hildebrandtii Rchb.f., Otia Bot. Hamburg.: 73 (1878).
Plants 10-20 cm tall: stem bare, with several sheaths basally, in the lower half, bearing above 3-4 rounded, embracing leaves, narrow (2.5-7 x 1-1.8 cm), rounded and embracing basally, alternate and very compressed; inflorescence several flowered, flowers very large. Hood wide and obtuse (8 x 12 mm), median sepal linear and 3 veined, petals semi-oval, very wide basally, very dilate on the external margin and very obtuse apically. Lateral sepals (10 x 5.5 mm) semi-oval, obtuse, 5 veined, the median projecting behind and with the median pouch wide and deep. Labellum abruptly cylindrical and narrow above the part joined to the column, enlarged in 3 very different appendages apically, the 2 laterals upright, thick, slightly recurved-lyrate apically, pubescent, provided on the internal surface with a channel with its margins ciliate, less acute and truncate apically, 1.8-2 mm long: median sessile, pendent from the front edge, very thick, in the form of a wide tail, arched-reflexed, flat basally, hollowed below, attenuate to a point apically, pubescent below and on the margins, covered above with very dense hairs, 5 mm long. Anther narrow (1.5 x 1 mm); cauda very thick and short, viscidiums discoidal, flat (0.6 mm in diameter) Rostellum large (2.2 x 1.5 mm), arms long (1.7 mm), bent and spatulate apically.
In dry woods and forests, from 200-1400 m alt.; flowering in December-January.
Comoros (Mayotte), N. Madagascar