Bulbophyllum macranthum Lindley 1844 SECTION Stenochilus J.J. Sm. 1914 Photo by © Eric Hunt and His Orchid Website
Dorsal view of flower, note movable lip at arrow Photo courtesy of Jay Pfahl
To 
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Common Name The Large Flowered Bulbophyllum
Flower Size 2" Tall [5 cm]
One of my favorites, blooms in the spring and fall with a solitary upside down flower [non-resupinate] that has a 2" [5 cm] long, basal, lateral, single flowered inflorescence that holds the fragrant [cloves] flower amid the leaves, occuring from Assam, Myanamar, Thailand, Malaysia, Vietnam, Borneo, Java, Moluccas, The Philippines, Sulawesi, Sumatra, Papua New Guinea and the Solomon Islands at altitudes of [sea-level] 700 up to 1500 meters and has a stout, hairy rhizome with well spaced, ovate-elliptic, unifoliate psuedobulbs and a single, oblong, fleshy, petiolate leaf. Best grown on a slab of tree fern or cork, given hot temperatures and good shade.
Similar to B praetervisum but if you compare the side photos of the 2 species you can see one of the defining differences. B macranthum has a much finer acute lip apex while B praetervisum has a wider less acute lip apex. The other is the lack of the two triangular stelida on the column which are very prominent on B praetervisum
Synonyms Bulbophyllum cochinchinense Gagn. 1950; Bulbophyllum patens Auct. no King ex Hkr. Gagn. 1951; Bulbophyllum purpureum Náves in F.M.Blanco 1880; Carparomorchis macrantha (Lindl.) M.A.Clem. & D.L.Jones 2002; Phyllorchis macrantha (Lindl.) Kuntze; *Sarcopodium macranthum Lindley 1850-1; Sarcopodium purpureum Rchb.f 1859;
References W3 Tropicos, Kew Monocot list , IPNI ; Bonplandia Rchb.f 1856 as Sarcopodium purpureum; The Orchids of Burma Grant 1895/95; Flora of Malaya Vol 1 Holtum 1957; The Orchids of Thailand Seidenfaden & Smitinand 1959 drawing, photo fide; Encyclopedia of Cultivated Orchids Hawkes 1965; AOS Bulletin Vol 39 No 2 1970 photo; AOS Bulletin Vol 39 No 4 1970 photo; The Orchids of Papua New Guinea An Introduction Millar 1978 photos fide; AOS Bulletin Vol 50 No 9 1981 photo; Manual of Cultivated Orchids Bechtel, Cribb & Laurent 1982; AOS Bulletin Vol 52 No 9 1983 photo; Die Orchideen Band 3 Sonderabdruck aus Schlechter Brieger, Maatsch and Senghas # 40 Bulbophyllinae 1983 photo fide; Orchid Genera in Thailand Vol VIII Bulbophyllum Thou. Seidenfaden 1990; Orchids of Java Comber 1990 photo fide; The Orchids of the Solomon Islands and Bougainville Lewis & Cribb 1991 drawing fide; Orchids of Borneo Vol 2 Vermeullen 1991 drawing/photo fide; Orchids of Penninsular Malaysia and Singapore Seidenfadden and Wood 1992 drawing/photo fide; The Plants of Mount Kinabalu Vol 2 Orchids Wood Beaman & Beaman 1993; A Checklist of the Orchids of Borneo Wood & Cribb 1994; Manual of Orchids Stewart 1995; A to Z of SE Asian Orchids O'Byrne 2000 photo fide; Bulbophyllums and Their Allies Seigerist 2001; Botanica's Orchids Laurel Glen 2001 photo fide; A Field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2001 photo fide; Orchids of Sumatra Comber 2001 photo fide; The Orchids of the Philippines Cootes 2001 photo fide; Australian Orchid Review Vol 67 No 2 2002 photo; Flora Malesiana Orchids of the Philippines Vol I Agoo, Shuiteman and de Vogel 2003; Australian Orchid Review Vol 70 No 3 2005; Orchids of India A Glimpse Misra 2007; AOS Bulletin Vol 77 No 12 2008 photo; New species of Bulbophyllum from eastern Malesia (Orchidaceae) Nordic Journal of Botany 26: 129195, 2008 Vermuellen; Wild Orchids of Penninsular Malaysia Ong, O'Byrne, Yong & Saw 2011 photo fide
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