9 B. helenae (Kuntze 1891: 676) Smith (1912: 24);

Seidenfaden (1973: 71, 1979: 157); Pearce & Cribb (2002: 469); Chen et al. (2009: 430). Phyllorkis helenae Kuntze (1891: 676) .

= Cirrhopetalum cornutum Lindley (1838: 75); Rhytionanthos cornutum (Lindley 1838: 75) Garay, Hamer & Siegerist (1994: 637) .

Type: — INDIA, Khasia, Nungclow, Gibson 31 (K-LINDL K 001368947 http://specimens.kew.org/herbarium/ K 001368947 photo!).

Habitat and phenology: —Primary humid evergreen broad-leaved forests at elevations 600–2000 m a.s.l. Trunk epiphyte. Flowering in August – December.

Distribution: — India, Myanmar, China, Thailand, Laos, Vietnam (doubtful).

Notes: —The early records of B. helenae by Averyanov et al. 2015 is actually B. nodosum, so occurrences of this species in Vietnam is doubtful.

Studied specimens: — INDIA, Mount Khasia, Hooker & Thomsom, s.n. as C. cornutum (M 0226978 http:// plants.jstor.org/stable/10.5555/al.ap.specimen.m0226978 photo!). INDIA, Sikkim; Sikkim Himalaya, June 1898, R. Pantling, 232 (L.1484515 https://data.biodiversitydata.nl/naturalis/specimen/ L.1484515 photo!). INDIA, Sikkim Himalaya, 1892, R. Pantling 232 (MNHN-P-P00348046 http://coldb.mnhn.fr/catalognumber/mnhn/p/p00348046 photo!). INDIA, Khasia J.D. Hooker & T.Thomson 6 (MNHN-P-P00348049 http://coldb.mnhn.fr/catalognumber/ mnhn/p/p00348049 photo!). MYANMAR, Hills around Ku-lu, May 1925, G. Forrest 26609 (E 00123412, https://data. rbge.org.uk/herb/ E 00123412 photo!). THAILAND, Kampaeng Phet, Klong Lan, 1240 m, 29 October 2002, M. van de Bult 601 (L.1484514, https://data.biodiversitydata.nl/naturalis/specimen/ L.1484514 photo!). THAILAND, Chiang Rai, Mae Sai, Doi Dtung (Tung), 28 September 2006, J. F. Maxwell 06- 683 (L.4175145 https://data.biodiversitydata. nl/naturalis/specimen/ L.4175145 photo!).