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Bulbophyllum yumtei

Bulbophyllum yumtei

Bulbophyllum yumtei J.J.Verm., Schuit. & de Vogel, Males. Orchid J. 21 (2018) 47

Type: Yumte 176 (holo L)

Epiphytes. Rhizome 0.4–0.5 cm diam.; rhizome scale leaves not persistent, only few thin fibers remaining. Pseudobulbs 0.5–1.3 cm apart, distinct, erect, ovoid, 2.0–3.4 by 1.0–1.4 cm, rounded in section, with age wrinkling with numerous longitudinal grooves. Leaf petiole 3.8–4.8 cm long; blade elliptic, 13.1–17.5 by 4.5–5.6 cm, index 2.9–3.2; apex acuminate. Inflorescences c. 5 cm long, solitary to few in a fascicle, 1-flowered; peduncle c. 1.1 cm long; scale leaves c. 2, the longest c. 1.3 cm long; floral bracts 1.3–1.4 cm long. Pedicel and ovary 1.4–2.2 cm long; basal node 0.15–0.25 cm above the floral bract attachment. Median sepal free, porrect to slightly recurved, ovate (and somewhat drawn out towards the apex), 2.4–2.8 by 0.9–1.3 cm, index 2.1–2.7; apex acute; margins entire; glabrous, rather thick and thicker towards the apex, c. 7-nerved. Lateral sepals as the median sepal but (slightly) recurved, slightly oblique, ovate-triangular, 2.1–2.6 by 1–1.2 cm, index 2.1–2.2; apex acute. Petals near the base adnate to the column, porrect, obovate-oblong, 0.4–0.5 by 0.14–0.15 cm, index 2.8–3.4, thin; margins entire; apex acute-acuminate; glabrous; 1-nerved. Lip about halfway recurved, c. triangular in outline, 0.4–0.42 by 0.34–0.36 cm, index 1.1–1.3 (without spreading) , thick; margins entire; apex subacute; glabrous; above with 2 high crests with sharp edges which define the outline of the lip towards its base (see note), and which converge towards the apex of the lip and merge into a single, high median ridge with a truncate crest near the apex of the lip, upper area in between the 2 crests c. flat towards the base of the lip, and slightly concave in the central part of the lip; below with a median ridge with a c. truncate crest along most of the length of the lip. Column including stelidia 0.42–0.5 cm long; column foot not widened; stigma elliptic; stelidia porrect, narrowly triangular, 0.25–0.32 cm long, with acute apex; upper margin near the base with a slight, deltoid, erose tooth; lower margin, lower down, with a slight, deltoid, rounded tooth; anther on underside with a rather narrow, rounded ridge, front drawn out into a rather thin, concave, triangular, obtuse beak, its surface glabrous; pollinia 4, the inner pair somewhat shorter than the outer pair.
(after Vermeulen, Schuiteman & de Vogel 2018)

Median sepal pale green, on upper side whitish in the center, with purple margins; on underside near the base with 7 purple lines. Lateral sepals on upper side purple shiny, towards base grading to whitish, tips yellowish green; on underside white suffused purple. Lip white with dense, fine purple spots. Column whitish

Epiphyte in stunted primary forest 10 m high on limestone ridge. Altitude c. 600 m

Malesia (New Guinea), endemic, see map

Indonesia (Papua Barat Prov., Maybrat Regency)

Warm growing epiphyte.


  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Dendrobieae
  • Subtribe Bulbophyllinae
  • Genus Bulbophyllum
  • Section Brachypus
  • Species Bulbophyllum yumtei

Bulbophyllum yumtei is unique in section Brachypus in the high ridges on the upper side of the lip which extend widely beyond the margins of the lip, but is further similar to Bulbophyllum katjae Verm., Schuit. & de Vogel, Bulbophyllum galactanthum Schltr., Bulbophyllum hans-meyeri J.J. and Bulbophyllum maxillarioides Schltr., but differs from Bulbophyllum katjae in the obovate-oblong petals (versus triangular), from B. galactanthum and B. hansmeyeri in the longer sepals (the median 2.4–2.8 cm long versus 0.7–1.3), and from B. maxillarioides in the free lateral sepals(versus partially connate) and the lip having high ridges

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Bulbophyllum yumtei

Bulbophyllum yumtei J.J.Verm., Schuit. & de Vogel. flower, oblique front view, photo A. Schuiteman, Yumte 176, from Indonesia, Papua Barat Prov., Aifat Regency

Bulbophyllum yumtei

Bulbophyllum yumtei J.J. Verm., Schuit. & de Vogel, drawing Jaap Vermeulen in Vermeulen, Schuiteman & de Vogel, Malesian Orchid Journal 21 (2018) 47, fig. 27

Bulbophyllum yumtei

Bulbophyllum yumtei J.J.Verm., Schuit. & de Vogel. plant habit with flower,photo A. Schuiteman, Yumte 176, from Indonesia, Papua Barat Prov., Aifat Regency