Species Information - Bulbophyllum quadrangulare

Bulbophyllum quadrangulare J.J.Sm., Bull. Jard. Bot. Buitenzorg, sér. 2, 2 (1911) 16

Type: Bogor cult. (Branderhorst) s.n. (upper Digoel) (holo BO; iso L [all probably, no loc, no coll.])

Synonyms:

• Bulbophyllum adenambon Schltr., Repert. Spec. Nov. Regni Veg. Beih. 1 (1913) 781
  - Type: Schlechter 16410 (holo B, lost)
• Bulbophyllum quadrangulare, J.J.Sm. var. latisepalum J.J.Sm. Nova Guinea 12, 4 (1916) 377
  - Type: Gjellerup 641 (holo BO, also alc.)

Rhizome long creeping, thin, entirely covered with tubular sheaths. Pseudobulbs c. 2-3.5 cm apart, obliquely erect, ovoid, quadrangular, longitudinally grooved, c. 1.2-1.7 by 0.7-1.13 cm; 1-leaved. Leaf subovate-lanceolate, acute, apiculate, coriaceous, c. 3.75-4.9 by 1.5-1.8 cm; base shortly contracted in a petiole; midrib above grooved. Inflorescences 1-flowered, erect, exceeding the leaves in length; peduncle filiform, c. 11.3 cm long, in the basal part with a few small, tubular peduncle-scales. Floral bract tubular, 0.38 cm long. Flower rather large, c. 4.5 cm long. Median sepal erect, linear, acute, concave, 5(-7)-nerved, c. 2.4 by 0.35 cm; margins incurved. Lateral sepals deflexed, parallel, linear, acute, slightly falcate, c. 9-nerved, c. 2.7 by 0.48 cm; apex narrowed. Petals very small, parallel to the column, broadly oblong, falcate, obtuse, undulate, 1-nerved, 0.3 by 0.18 cm; upper margin erose except at the base; lower margin lacerate, proximally with a rather large lacerate lobule; apex acute, erose. Lip strongly mobile, in outline oblong, at a third above the base recurved, slightly 3-lobed, fleshy; base below the place of insertion bilobed, with retrorse lobes, 0.4 cm long; lateral lobes erect, somewhat retrorse, separated by a deep furrow in between; mid-lobe somewhat spathulate-obovate, distally suborbicular-dilated, rounded, proximally convex underneath, upper side convex, rugose, with a short longitudinal rib, underneath concave; apex broadly rounded, slightly more than 0.2 cm wide. Column 0.17 cm long; below the stigma with a callus; stigma deeply concave, ovate; stelidia distinctly exceeding the anther, subulate, slightly falcate; column-foot making an obtuse angle with the ovary, strongly incurved, when not flattened 0.18 cm long, distally strongly dilated and with a widely patent conical lobule on either side, its apex free. Anther cucullate, c. 0-06 cm long; connective strongly crested, its apex elongated and conduplicate. Ovary 6-grooved, 0.3 cm long; pedicel filiform, c. 1.3 cm long, articulate 0.33 cm above the base. (After Smith, 1913)

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