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Acianthinae_species
Corybas royenii Kores
Nomenclature
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Subgenus: CorybasSection: Gastrosiphon
SUMMARY
Plant: small, erect herb, 1—3 (—7) cm tall.
Tuber: globose, 4—6 mm in diameter, white or light brown, finely villose.
Rhizomes: and subterranean portion of the stem white, scattered villose.
Stem: semiterete, 1—7(—10)cm long.
Sheath: 8—12 mm long, 1-nerved, slightly flared distally, ultimately free for 1—2 mm, free portion acuminate, apex cirriform.
Leaf: ovate or elliptical-ovate, 1.5—3(—6) by 1—1.5(—2) cm, light green above, paler below, apex narrowly acuminate, base shortly attenuate and decurrent into 2 ribs of the stem, midrib impressed above, prominently raised below, nerves 2 on either side of the midrib, convergent, suprabasql nerves 4 to 6 on either side of the midrib, laxly scalariform reticulate, marginal veins absent.
Pedicel: terete, 2—4 mm long, glabrous, subtended by a single bract.
Bract: linear, channelled, (5— )10—17 by 2—3 mm, pale green, narrowly acute, 1-nerved, glabrous.
Ovary: ascending and slightly inflexed, cylindrical, 6—10 by 2—3 mm, greenish-white, twisted, 6-grooved, glabrous.
Median sepal: erect, spathulate, 20—30mm long overall, 7—9-nerved, white with 5—7 narrow maroon bands running along the mid and lateral nerves, claw narrowly attenuate, channelled, 10—15 mm long, blade ovate, 10—15 mm by 7—14 mm, margin slightly or not inflexed, entire, apex obtuse.
Lateral sepals: reduced, subulate, 3—6 by 0.5 mm, light green, 1-nerved, glabrous.
Lateral petals: free, erect and slightly reflexed, linear, acute, 15—30 by 2—3 mm, whitish-green at the base, darkening gradually to maroon distally, ultimately becoming reddish-black at the tips, 1-nerved, glabrous.
Lip: erect, infundibular, abruptly reflexed and expanded horizontally at the limb, 15—20mm long overall, conspicuously bicalcarate at the base, spurs 2—3 mm long, tube 10—15 mm long in all, conspicuously inflated dorsally along its entire length, inflated portion longitudinally keeled and strongly compressed laterally, green to greenish-white at the base, gradually darkening to greenish-brown medially, upper portions of the tube and throat purple-brown with irregularly spaced brown blotches, limb broadly cordate, 8—12 by 7—10mm, apex blunt, deflexed, margin inflexed, membranous, irregularly fimbriate-laciniate, central portion of the limb expanded into a hemispherical boss, 6—10 mm wide by 1—2 mm tall, boss, throat and interior of the limb purple-black, laxly, minutely pubescent, limb externally greenish-white, irregularly marked with brown blotches, glabrous.
Column: erect, 2 mm long.
Fruit: not seen.
Distribution: Papua New Guinea. Enga Province: Burgers Mts., summit region of Mt. Burgers, Eastern Highlands Province: Mt. Otto
Ecology: rooted in moss cushions on the forest floor in dense shade
Elevation: 3650 m, 3250m