Species Information - Dendrobium lacorum

Dendrobium lacorum P.Royen, Alp. Fl. New Guinea 2 (1979) 290

Type: Brass 10850 (holo L, iso AMES).

Synonyms:

• Dendrobium lacorum P.Royen, Alp. Fl. New Guinea 2 (1979) 290, fig. 100 ('lagorum').
  - Type: Brass 10850 (holo L, iso AMES).

Roots to more than 25 cm long, 1-2 mm diameter. Rhizome very short. Pseudobulbs crowded, broadly cylindrical, smoothly 4-ribbed, 8-18 mm long, 3-6 mm diameter (often c. 2 mm diameter in dried material). Leaf elliptic, index 2-4.4, 1.3-2.2 cm by 5-9 mm, base cuneate-subpetiolate, apex obtuse, minutely bilobulate, mucronate, mucro longer than the lobules. Inflorescences terminal from the leaf axil and subterminal just below the abaxial side of the leaf, solitary or up to 3 in succession from the same position, at the base with a 5 mm long tubular sheath, sometimes with a 2-3 mm long spathe. Peduncle 5-6 mm long. Ovary and pedicel 10-13 mm long, 3-winged, glabrous. Flower c. 1.3 cm across. Median sepal patent, narrowly ovate, 7 by 3.2 mm, obtuse, 3-nerved. Lateral sepals patent, obliquely ovate, 7 by 4.1 mm, obtuse, 5-nerved; mentum cylindrical, straight, narrowed to the apex, 4.6 mm long, entirely closed, apex subacute. Petals porrect, apical half reflexed, ovate-lanceolate, 6.1 by 2.5 mm, entire, obtuse, 3-nerved. Lip spathulate, 3-lobed, glabrous; hypochile 8.6 mm long, of which the narrow claw is adnate to the column foot, 5.2 mm wide across the flattened lateral lobes; lateral lobes erect, obliquely broadly semi-elliptic, 1.8 by 2.5 mm, margins slightly irregular, apex subtruncate; midlobe broadly elliptic, 5.2 by 4.2 mm, fleshy, apical margin crispate, apex broadly rounded, apiculate; callus narrowly hemi-ovoid, subglabrous, on basal half of midlobe, entire. Column 1.6 mm long, glabrous, wings broadly rounded, entire, clinandrium entire, with a narrowly triangular median tooth; foot 4.6 mm long, glabrous. Anther cucullate, 0.8 by 1 mm, base emarginate; apex truncate, papillose; pollinia not seen. Fruit ellipsoid, 10 by 5 mm, 3-winged.

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