Bulbophyllum stenobulbon

Bulbophyllum stenobulbon Par. & Reiclienb. f.

Bulbophyllum stenobulbon Par. & Reiclienb. f.; photos © L. Averyanov

1874, Trans. Linn. Soc. London 30, 1: 153: Seidenf., 1992, Opera Bot. 114: 297; P. H. Ho, 1993, 111. FI. Vietnam 3, 2: 1109, f. 10260; Aver., 1994, Ident. Guide Vietnam. Orch.: 263; Thin, 1997, Sida 17, 4: 756, sub ”stenobullon" Aver. & Averyanova, 2003, Updated Checkl. Orch. Vietnam: 17.

Synonyms.

Bulbophyllum concinnum auct. non Hook, f., 1890: Gagnep., 1932, in Lecomte, Fl. Gen. Indo-Chine 6: 272. 

Studied collections. 

2 May 1985, Averyanov et al., LX-VN1828/71.

Description. 

Tiny epiphyte and lithophyte with long, thin, slender, creeping rhizome 1—1.5 mm thick and erect oblong-globose l-leaved pseudobulbs 0.8—1.2 by 0.3—0.5 cm. Leaves sub-sessile, narrowly oblong-elliptic, 1.5—3 bv 0.6—1 cm. Inflorescence appearing from the base of pseudobulb, 0.8—1.5 cm long, with 2—3 flowers. Flowers 5—6 mm across. Sepals and petals white to yellowish, with yellow-orange tips. Sepals sub-similar, lanceolate, acuminate, with thickened apex, 5 by 2 mm. Petals broadly ovate, obtuse to acute, 2.5—3.5 by 1—1.5 nun. Lip about 3 mm long, simple, narrowly ovate, decurved, with erose margins, upper surface convex, with an elongate central pit. Column with long filiform stelidia.

Flowering time. 

April-June.

Geographic range. 

Bhutan, NE. India, Myanmar, China, Thailand, Laos, Vietnam.

Notes. 

A tiny plant commonly growing in canopies of large trees, it is easily overlooked during field studies and collecting. In Vietnam probably rather common and widespread.

References:

Leonid V. Averyanov, Nguyen Tien Hiep, Phan Ke Loc, The orchids Of Cuc Phuong National Park Illustrated guide, ISBN: 9781626751514