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Collabium carinatum

Collabium carinatum

Collabium carinatum de Vogel, Orchid Monogr. 8 (1997) 152, fig. 73

Type: Reeve 3425 (holo L; iso CBG, E, K, LAE, NSW)

Plant 21-42 cm high excluding the inflorescence. Roots 1-5 on each rhizome part between 2 pseudobulbs, to 6 cm long, 0.1-0.2 cm diam. Rhizome not branching, fleshy, to 6 cm long, 0.3-0.5 cm diam. Rhizome scales soon disintegrating, only remnants seen. Pseudobulbs alternatingly 1-3 bearing a leaf and 1 bearing an inflorescence, c. 1 cm apart, articulated at the top, when dried finely longitudinally wrinkled; leaf-bearing ones somewhat quadrangular, slightly tapering to the top, 1.4-2.5 cm long, 0.25-0.5 cm diam.; inflorescence-bearing ones cylindrical, 2-2.5 cm long, 0.3-0.5 cm diam. Pseudobulb scales only remnants seen, probably 5-10.5 cm long. Petiole 3-7 cm by 0.2-0.4 cm. Leaf blade lanceolate, 12-40 by 4.3-10 cm; top acuminate; base attenuate; main nerves 5-7, below prominent, above somewhat prominent; small nerves many. Raceme 15-17-flowered. Scape 29-37.5 cm long, 0.2-0.4 cm diam.; internodes 3, lower one 7.5-9 cm long, higher ones 9.5-13 cm long; scales 2.4-6.3 cm long, 0.3-0.6 cm diam., top acute, nerves 11-21. Rachis angular, to 14.5 cm long, 0.2-0.25 cm diam.; internodes 0.3-2 cm long. Bracts reflexed, linear, 6-16 by 0.25-0.4 cm; top acute; nerves 3-5. Flowers rather laxly placed at irregular distances along the rachis, many open at the same time, rather widely open. Pedicel hardly grooved, 0.45-0.7 by 0.07-0.13 cm; ovary somewhat longitudinally grooved, 0.8-0.9 by 0.13-0.15 cm. Median sepal lanceolate, 0.85-1.1 by 0.18-0.25 cm; top acute; nerves 3, midrib prominent outside. Lateral sepals hardly unequal, lanceolate, falcate, 0.9-1.2 by 0.2-0.25 cm; top acute; nerves 3, midrib prominent outside. Petals hardly different in shape, obovate-lanceolate, hardly falcate, 0.85-0.88 by 0.17-0.2 cm; top (obliquely) acute to rounded; nerves 3, midrib prominent outside. Lip 0.85-1 cm long. Hypochile c. 0.5 by 0.5-0.8 cm; claw 0.2-0.3 by 0.08-0.2 cm; lateral lobes more or less erect, projecting in front, ligulate, 0.2-0.25 by 0.1-0.2 cm, with an obtuse to obliquely truncate top and an erose top margin; claw with 3 keels, the median one swollen; blade with 2 lateral keels, each of which between the lateral lobes of the lip turns into an oblique pyramid 0.12-0.2 cm long, 0.1-0.12 cm wide, c. 0.05 cm high which is hollow to a depth of 0.02-0.03 cm, each provided with a keel-like ridge with an extended, obtuse to rounded top, each keel beyond the pyramid continuing on the epichile; beyond the pyramids with a median keel. Epichile somewhat recurved, in outline broadly spathulate or rectangular, 0.45-0.55 by 0.45-0.6 cm; top obtuse to truncate to slightly emarginate, sometimes with acute tip; front margin erose, often somewhat incurved; keels 3, high, plate-like, thin, erect, up to 0.05-0.08 cm high with entire, irregular margin, in front lowering and ending c. 0.1 cm from the top of the epichile; between the lobes of the hypochile somewhat fleshy, starting from this place with a high, plate-like, thin median keel up to 0.03-0.05 cm high with an irregular, on the basal half often double crested margin, which ends about 0.15 cm from the top of the epichile. Column with a more or less slight counter clockwise torsion, upper part slightly curved forward, somewhat swollen at the truncate, obtuse-tipped top, 0.5-0.6 by 0.1-0.12 cm; seams c. 0.02 cm wide, ending laterally of the stigma and there not drawn out into triangular wings; column-foot with a slender, conical spur 0.45-0.5 cm long, 0.12-0.2 cm wide, with a rather acute, hardly emarginate top. Anther reniform, c. 0.1 by 0.15 cm; top broadly rounded with irregular margin; base emarginate. Pollinia c. 0.06 by 0.04 cm. Stigma semi-elliptic, c. 0.15 by 0.08-0.1 cm; rostellum truncate, 0.04-0.06 by 0.06-0.1 cm. Fruit body ellipsoid, c. 0.25 by 0.06 cm, on top the column and the back wall of the spur of the column-foot persistent; juga c. 0.07 cm wide, median with a faint ridge; valvae up to c. 0.4 cm wide, outside with a low rounded keel, hairs inside along the margin up to 0.07 cm long. Seeds fusiform, up to 0.09 by 0.01 cm; embryo elliptic, c. 0.005 by 0.003 cm. (After Van der Burgh and De Vogel, 1997).

Note: Differs from Collabium vesicatum especially in the conical, at the top narrowly obtuse spur.

Leaves spotted dark green. Sepals and petals green, lip white, the spur once recorded yellow, column white.

Terrestrial in (secondary) upper montane forest in shaded positions. Altitude 1650-2350 m.

Malesia (New Guinea, endemic).

Papua New Guinea. See map

distribution in New Guinea

Cool growing terrestrial, keep in shade.

April, July, August.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Undetermined
  • Subtribe Collabiinae
  • Genus Collabium
  • Species Collabium carinatum

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Collabium carinatum

overview picture

Collabium carinatum

Collabium carinatum de Vogel, habit (in situ), photo N.E.G. Cruttwell, based on Cruttwell (/80, PNG, Mt. Gahavisuka)

Collabium carinatum

Collabium carinatum de Vogel, inflorescence, photo N.E.G. Cruttwell, based on Cruttwell (5/83, PNG, Mt. Gahavisuka)

Collabium carinatum

Collabium carinatum de Vogel, from Orchid Monogr. 8 (1997) fig. 73, drawing A. Schuiteman and E.F. de Vogel, based on Reeve 703 (plant) and Reeve 3494 (all other parts)