Cleisostoma fuerstenbergianum Kraenzl.

Cleisostoma fuerstenbergianum Kraenzl. 1908

Cleisostoma fuerstenbergianum Kraenzl, Photo by 蘇清記

Cleisostoma fuerstenbergianum Kraenzl.1908, Feddes Repert. 7: 39; Guillaumin, 1933, in  Lecomte, FI. Gen. Indo-Chine 6: 491; Seidenf., 1992, Opera Bot. 114: 395: P. H. Ho, 1993, 111. FI. Vietnam 3, 2: 1083, f. 10182; Aver., 1994, Ident. Guide Vietnam. Orch.: 3S4; Aver. & Averyanova, 2003, Updated Checkl. Orch. Vietnam: 21; Soejarto et al., 2004, Seed plants CPNP: 447.

Synonyms.

Sarcanthus flagelliform is Rolfe ex Downie, 1925, Bull. Misc. Inform. Kew 1925: 393; Guillaumin, 1933, in Lecomte, Fl. Gen. Indo-Chine 6: 4S5.

Sarcanthus geoffrayi Guillaumin, 1930, Bull. Soc. Bot. France 77: 329; Guillaumin, 1933, in Lecomte, Fl. Gen. Indo-Chine 6: 484.

Saccolabium filiforme auct. non Lindl., 1S59: Guillaumin, 1933, in Lecomte, Fl. Gen. Indo-Chine 6: 497. 

Studied collections.

11Dec.1999,DDS11281;18May2002,Averyanovetal.,HAL1601: sinedate,M IN340.

Description. 

Epiphyte with pendulous slender sometimes branching stems to 1.2 m long with numerous distant straight terete pendent leaves. Leaves 15—30 by 0.3—0.4 cm, obtuse. Inflorescence lateral, pendulous, many-flowered, 8—15 cm long. Floral bracts minute, triangular, about 1 mm long, reflexed. Flowers widely opening, 6—8 mm across. Sepals and petals deep brown, 4—5 mm long. Sepals narrowly-ovate, petals lanceolate to linear, slightly shorter. Lip spurred, white, with 3 fleshy lobes; side-lobes erect, with incurved tips; mid-lobe broad sagittate, straight, forward directed. Spur white to pink, short and broad, saccate about 2 mm long. Back-wall callus rhomboid, indistinctly 3- lobed at the base. Column white to yellowish, stout, 1.5—2 by 1—1.5 nun. Stipe large, broadening to the apex with large horseshoe-shaped viscidium. Fruit ellipsoid capsule, 8—14 by 4—7 mm.

Flowering time. 

May-June.

Geographic range. 

S. China, Hainan, Thailand, Laos, Cambodia, Vietnam.

Notes. 

Very common species, particularly in lowland limestone areas of northern Vietnam.

References:

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