SECTION Rhytionanthos [Garay, Hamer & Siegerist] J J Verm, Schuit & De Vogel 2014

Synonyms *Rhytionanthos Garay Hamer and Sigerist 1994

Type: Bulbophyllum cornutum (Lindl.) Rchb. f. 1864 = Bulbophyllum helenae J.J. Sm. 1912

New shoots develop from beneath the pseudobulb but are not fused to it, the solitary inflorescence arise from beneath the pseudobulb and carries 2 to many spirally arranged flowers. B paraemarginatum and B rheedei both have single flowers. The peduncle has 3 to 5 bracts. The rachis is thickened or not, and carries resupinate, simultaneously opening flowers and the basal node of the pedicel is slightly above the attachment of the floral bracts. The dorsal sepal is free, the laterals are free or adherent or connate along the upper margins and sometimes along the lower margins and 2 to 5 times as long [except B boninense which is only slightly longer]. The stigma is not proximally protruding, The anterior margin of the anther is drawn out into a rounded beak and there are 4 pollina, the inner ones more than 1/2 as long as the outer ones.

This section differs from Section Ephippium in having erose to denticulate petal margins and the margins of the median sepal are entire to erose.

This section has 16 species occuring in forests at elevations up to 1500 meters in Sri Lanka, India, Nepal, China, Myanmar. Thailand, penninsular Malaysia, Laos, Vietnam, Sumatra, Java, Borneo and the Philippines

Entries below with an asterix are listed in publications by J J Vermeullen and so are more likely correct than ones without. Species with a question mark in front, seem to me to not conform and so please use with caution.

  1. *Bulbophyllum bomiense Z.H.Tsi 1978 - Tibet

  2. *Bulbophyllum chondriophorum (Gagnep.) Seidenf. 1973 publ. 1974 Sichuan China

  3. Bulbophyllum elegans Gardner ex Thwaites 1861 southwestern India and Sri Lanka

  4. Bulbophyllum forestii Seidenf. 1974 China, Myanmar, Thailand, Laos and India

  5. *!Bulbophyllum helenae J.J. Sm. 1912western Himalayas, Nepal, Sikkim, Myanmar and Thailand

  6. *Bulbophyllum paraemarginatum Aver. 2007 Vietnam

  7. Bulbophyllum purpurascens Teijsm & Binn 1862 Thailand, Myanmar and the islands of Sumatra, Java, and Borneo

  8. *Bulbophyllum rheedei Manilal & C.S.Kumar 1991 India

References Genera Orchidacearum Vol 6 Epidendroideae Pt 3 Pridgeon, Cribb Chase & Ramussen 2014; Orchid *Bulbophyllum of Borneo J J Verm, P O'Byrne and Lamb 2015; *Phytotaxa 166 (2): 101113 J.J.Verm., Schuit. & de Vogel 2014