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Genus Bulbophyllum section Uncifera

Genus Bulbophyllum section Uncifera

Bulbophyllum section Uncifera Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 697. Type species: Bulbophyllum ochroleucum Schltr.

Synonyms:

  • Genus Bulbophyllum Section Diceras Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 697
  • Genus Bulbophyllum Subgenus Harpobrachium Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 695
  • Genus Bulbophyllum Section Manobulbon Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1912) 696

Small to medium sized epiphytes. Roots sprouting from nodes along the length of the rhizome, or mainly close to the base of the rhizomes, spreading, glabrous to minutely hirsute locally. Rhizomes creeping, straggling, or erect to stiffly pendulous; rhizome bracts thin, surface minutely colliculate to papillose or transversely rugate, caducous including the veins. Pseudobulbs conspicuous compared to the size of the plant, 1-leafed, with shoots sprouting from its (sub-)basal node and free, not fused to the pseudobulb. Leaves persistent, thick, nerves inconspicuous. Inflorescences sprouting from nodes along the length of the rhizome or from the (sub-)basal node of the pseudobulb only, single to fasciculate, 1-flowered or racemose with flowers spirally arranged; peduncle shorter or longer than the pseudobulbs but not exceeding the leaf tips; peduncle scales 2—8, scattered but most in the basal half of the peduncle; rachis, if present, not thickened; floral bracts tubular. Flowers per inflorescence several to all open at a time. Pedicel with the basal node well above the attachment of the floral bract, as long as the ovary or (distinctly) longer. Sepals free, the lateral sepals not or hardly longer than the median one, elliptic to ovate, 0.2—2.1 cm long, glabrous, (rather) thin; apex obtuse to acute (acuminate to caudate in Bulbophyllum cavibulbum); 3-nerved (5-nerved in Bulbophyllum posticum). Petals 0.1—0.6 cm long, elliptic to ovate, thin; margins entire, sometimes slightly erose (distally), sometimes finely papillose distally; apex rounded to acute;1-nerved (3-nerved in Bulbophyllum posticum), surface glabrous. Lip mobile on a thin ligament, without auricles near the ligament, undivided, 0.06—0.5 cm long, elliptic to ovate or oblong, sometimes sub-panduriform, glabrous; adaxially with or without two hardly to distinctly converging ridges in approx. flexural position, and with or without two short converging ridges, knobs or teeth close to the base. Column with rostellum front receding in between the stelidia tips; stigma large, without keels inside, proximally not or hardly protruding; column foot tapering towards its top, free part long; approx. without a small median callus just short of the ligament; stelidia 1/2 the length of the column or shorter; short but usually not rudimentary, approx. semi-elliptic, deltoid to triangular, with a distinct, patent and downwards directed, straight or recurved, semi-elliptic tooth along the lower margin, close to the tip; anther with a low, rounded crest, in front not concave, front margin drawn out into a small to distinct, semi-circular to triangular beak; pollinia 2 or 4, with the inner ones as long as the outer ones or shorter (longer in Bulbophyllum bigibbum); without appendages.


New Guinea, West Pacific; Australia .

Genus Bulbophyllum section Uncifera contains 8 accepted species (36 names); in New Guinea 7 species.

Montane forests. Altitude up to 2800 m

  • Vermeulen, J.J., A taxonomic revision of Bulbophyllum sections Adelopetalum, Lepantanthe, Macrouris, Pelma, Peltopus, and Uncifera (Orchidaceae) Orchid Monographs 7 (1993) I-VI, 1-324, 6 plates.
  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Dendrobieae
  • Subtribe Bulbophyllinae
  • Genus Bulbophyllum
  • Section Uncifera

Revised in Vermeulen (1993: 176).

Genus Bulbophyllum section Uncifera in New Guinea contains 7 species:

Bulbophyllum bigibbum
Bulbophyllum cavibulbum
Bulbophyllum cylindrobulbum
Bulbophyllum laxum
Bulbophyllum manobulbum
Bulbophyllum ochroleucum
Bulbophyllum posticum


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Genus Bulbophyllum section Uncifera

Bulbophyllum cylindrobulbum Schltr., inflorescence, photo A. Schuiteman, Leiden cult. 930351

Genus Bulbophyllum section Uncifera

Bulbophyllum cylindrobulbum Schltr., plant habit, photo A. Schuiteman, Leiden cult. 930351

Genus Bulbophyllum section Uncifera

Bulbophyllum ochroleucum Schltr., flower detail, column and lip base, lateral sepal and petal removed, oblique lateral view, photo P. Jongejan, collection Royal Botanic Garden

Genus Bulbophyllum section Uncifera

Bulbophyllum ochroleucum Schltr., plant habit and flower analysis, J.J. Vermeulen, drawing