Cynorkis papillosa (Ridl.) Summerh., Kew Bull. 6: 461 (1951 publ. 1952).
Homotypic Synonyms:

Habenaria papillosa Ridl., J. Linn. Soc., Bot. 21: 504 (1885).
Heterotypic Synonyms:
Peristylus filiformis Kraenzl., Abh. Naturwiss. Vereine Bremen 7: 258 (1882).
Habenaria filiformis (Kraenzl.) Ridl., J. Linn. Soc., Bot. 21: 504 (1885).
Helorchis filiformis (Kraenzl.) Schltr., Repert. Spec. Nov. Regni Veg. Beih. 33: 36 (1924).
Cynorkis filiformis (Kraenzl.) H.Perrier, Arch. Bot. Bull. Mens. 5: 48 (1931), nom. illeg.
Bicornella filiformis (Kraenzl.) Szlach. & Kras, Richardiana 6: 144 (2006).
Description:

Plants very thin, subfiliform, 25-40 cm tall, glabrous and without developed leaves; tubers 2, oblong; scape bearing several sheaths; inflorescence sub dense, 10-30 flowered, very small flowers, glabrous, white with the labellum tinted violet; bracts slightly shorter than the pedicel. Sepals oval-oblong, the median concave. Petals slightly shorter than the sepals, joined basally to the sepals and the labellum. Labellum not longer than the petals, oblong entire or bisinuate on each side toward the lower third, obtuse and 5 veined: spur connical and very short. Anther short, emarginate apically; channel very short; cauda very line and retracted; staminodes very short, rounded and verrucose. Rostellum very small (0.2 mm), obviously tridentate in front teeth truncate. Stigmas abort, porrect and free apically. Pedicel glabrous, 5 mm long nr more.
Habitat:

In peat bogs, from 1500-2000 m alt., flowering in January, very common.
Distribution:

C. & E. Madagascar