Bulbophyllum leysianum Burb. 1894 SECTION Hyalosema Schlechter 1911

Photos courtesy of Dr Leslie Garay Archives, Photo by Jo Levy Copyright

Lip Detail

Photo by Paw Paw and the Orchids Online Forum

Another Flower [what was known as B ornithorhynchum]

Lip detail [what was known as B ornithorhynchum]

Photos by Bob Fallon Copyright , and the Dr Leslie Garay Archives

Common Name The Leysia Bulbophyllum

Flower Size

This species is from penninsular Malaysia, Sabah Borneo and Java in wet primary forests at elevations of 300 to 600 meters as a small sized, hot to warm growing epiphyte with .6" [1.5 cm] between each distinct, ovoid, obtusely 4 angled pseudobulb carryijng a single apical, erect, elliptic to obovate, rounded to obtuse, narrowing below into the petiolate base leaf that blooms on a longer than the leaf, 6 to 8" [15 to 20 cm] long, basal, slender, single flowered inflorescence, with triangular, tubular sheaths that turn brown with age, and holds the flower above the leaves.

CAUTION Often cited as a synonym of B. antenniferum.

J J Vermeulen states that this species is separate from B. antenniferum but includes B ornithorhynchum as a synonym. There has been much confusion over these three species but the most distinctive separation is B antenniferum has an ovate-triangular lip that is .088 to .089" [2.2 to 2.9mm] wide and is slightly constricted approx half way along its length and is adaxially minutely hirsute in the center and glabrous to minutely hirsute towards the apex. B leysianum has an oblong, hardly widening towards its base lip that is adaxially coarsly hirsute in the midle half of its length and then grading to finely hirsute towards the base and the apex. The lip is .048 to .078" [1.2 to 1.9mm wide].

Synonyms Bulbophyllum leysenianum Burb. 1895; Bulbophyllum ornithorhynchum (J.J.Sm.) Garay, Hamer & Siegerist 1992 ; Cirrhopetalum ornithorhynchum J.J.Sm. 1903; Hyalosema leysenianum (Burb.) Rolfe 1919; Hyalosema ornithorhynchum (J.J.Sm.) Rysy 2002

References W3 Tropicos, Kew Monocot list , IPNI ; Die Orchideen Von Java J.J.Sm. 1905; Die Orchideen Von Java Figuren Atlas J.J.Smith 1908 drawing fide; Orchidaceae of German New Guinea Schlechter 1913/85; Orchidaceae of German New Guinea Schlechter 1913/85 as B ornithorhynchum; Notes on Cirrhopetalum Seidenfaden 1973 as B antenniferum; Orchids of Java Comber 1990 as B antenniferum; Bulbophyllum and Their Allies Siegerist 2001 as B ornithorhynchum photo fide; Bulbophyllum of Borneo J J Verm, P O'Byrne and Lamb 2015 photos/drawing fide; AOS Bulletin Vol 86 #8 2017 photo fide; LANKESTERIANA 20(1): 3136. 2020 photo fide