Genus Bulbophyllum section Tapeinoglossum

Genus Bulbophyllum section Tapeinoglossum

Bulbophyllum section Tapeinoglossum (Schltr.) J.J.Sm., Nova Guinea 12 (1916) 406. Type species: Bulbophyllum centrosemiflorum Schltr.


  • Genus Tapeinoglossum Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1913) 892

Minute or small epiphytes. Roots sprouting below the pseudobulbs, spreading, glabrous, locally slightly hirsute. Rhizomes creeping or straggling; rhizome bracts thin, approx. glabrous, caducous including the veins. Pseudobulbs conspicuous compared to the size of the plant, 1-leafed, with shoots usually sprouting from its basal node and free, not fused to the pseudobulb. Leaves persistent, thick; nerves inconspicuous. Inflorescences sprouting from nodes along the length of the rhizome, single, 1-flowered; peduncle shorter than the pseudobulbs; peduncle scales 3, (sub-)basal; floral bracts tubular. Flowers not resupinate. Pedicel with the basal node well above the attachment of the floral bract, longer than the ovary. Median sepal connate to the laterals for a short distance near the base, 1.5—1.6 cm long, elliptic to obovate, thin; margins ciliolate; apex obtuse; 5-veined; surface shortly papillose-hirsute towards the margins. Lateral sepals connate along the lower margins, shorter than the median one, elliptic to obovate, c. 1.1 cm long, thin; margins glabrous to papillose or hirsute; apex obtuse; 5-nerved, adaxial surface long-hirsute, abaxial surface shortly papillose-hirsute. Petals elliptic to ovate, glabrous, c. 0.2 cm long, thin; apex rounded to obtuse; 3-nerved. Lip mobile on a thin ligament, without auricles, undivided, 0.2—0.25 cm long, ovate, glabrous; margins entire; adaxially concave, with two parallel, hirsute ridges, surface otherwise approx. glabrous. Column with the rostellum front well receding in between the stelidia; stigma wide, without keels inside, or with a single keel on the back wall, proximally not protruding; column foot deeply concave, half-way its length constricted by the inwards-folded margins, free part short, tip without teeth; stelidia less than 1/2 of the length of the column, short, triangular, with or without a small tooth along the upper margin close to the tip, with an inconspicuous, rounded wing along the lower margin; anther abaxially (?) furrowed, in front inflated and deeply concave, front margin not drawn out; pollinia 2, without appendages.

NewGuinea. Endemic.

Bulbophyllum section Tapeinoglossum contains 2 species (2 names); in New Guinea 2 species.

Hill forests. Altitude up to 900 m.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Dendrobieae
  • Subtribe Bulbophyllinae
  • Genus Bulbophyllum
  • Section Tapeinoglossum

Plants of Genus Bulbophyllum section Tapeinoglossum are morphologically in between Bulbophyllum sections Hyalosema and Hoplandra. They differ from both in: median sepal fused to the laterals proximally, column foot concave, constricted. From section Hyalosema they differ further in:the smaller flowers, pollinia 2; from Hoplandra in the flat median sepal.

Genus Bulbophyllum Section Tapeinoglossum includes 2 species. The description is based on Bulbophyllum centrosemiflorum J.J.Sm. Of Bulbophyllum nannodes Schltr. only the original description is known, its status is uncertain.

In New Guinea Bulbophyllum section Tapeinoglossum contains 2 species:

Bulbophyllum centrosemiflorum
Bulbophyllum nannodes

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Genus Bulbophyllum section Tapeinoglossum

Bulbophyllum centrosemiflorum J.J.Sm., flower, front view, photo A. Schuiteman, Leiden cult. 950216

Genus Bulbophyllum section Tapeinoglossum

Bulbophyllum centrosemiflorum J.J.Sm., plant habit, photo A. Schuiteman, Leiden cult. 950216

Genus Bulbophyllum section Tapeinoglossum

Bulbophyllum centrosemiflorum J.J.Sm., flowers, front view, photo A. Schuiteman, Leiden cult. 950216