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Cleisostoma clemensiae

Cleisostoma clemensiae

Cleisostoma clemensiae Ormerod, Orchadian 16 (2008 ) 82, fig.

Type: M.S. Clemens 12203A (holo AMES).

Stems erect or becoming erect from a decumbent base, slightly compressed, oval in cross-section, leafy near the apex, concealed throughout by leaf sheaths, 4.0-26.2 by 0.3-0.6 cm. Leaves elliptic, oblong to ligulate, 4.5-15.5 by 1.7-3.1 cm; margins entire to minutely denticulate; apex evenly rounded to obliquely truncate to inequally obtusely bilobed; thickly coriaceous; midnerve carinate below. Inflorescence erect, paniculate, rarely racemose, to ca. 34 cm long; peduncle 5.5-16.7 cm long, with 1 or 2 tubular sheathing scales 0.55-0.60 cm long; panicle 7.0-18.5 cm long, 1-6 branched, branches patent to erect, each 3-8 cm long, laxly partly sequentially 5-14 flowered; floral bracts broadly ovate, acute, 0.2 by 0.2 cm. Pedicel and ovary 0.3-0.35 cm long. Median sepal broadly elliptic, 0.5 by 0.33-0.34 cm; apex obtuse. Lateral sepals obliquely obovate-elliptic, 0.6 by 0.33 cm; apex subacute. Petals oblong, 0.47 by 0.18 cm; apex acute. Lip spurred, 3-lobed; spur ellipsoid-conical, 0.34 cm long dorsally, with obtuse apex; back wall callus bifurcate, ventrally pubescent, sealing the spur entrance by its proximity to the front wall callus but movable so entry can be gained; behind the back wall callus with a transverse membrane connected to each side of the spur and the back of the callus that acts like a spring; front wall callus fused to the lateral lobes, lunate (viewed from above), upper half papillose to pubescent; lateral lobes obliquely rectangular-deltate, 0.22 by c. 0.1 cm in the middle, 0.15 cm wide near the apex, with subacute apex; midlobe fleshy, oblong lanceolate (viewed from above) , 0.4 by 0.2 cm, with obtuse apex, basally with a fleshy obliquely triangular medial callus. Column semi-cylindric, 0.28 cm long, basally dilated to form a ‘foot’ ca. 1 mm long; rostellum very short, bifid; anther cap and pollinarium not seen.
(after Ormerod 2008)

Flowers with brown mottled sepals and petals, base of spur white, lip with purple marks inside.

Lower montane forest, often near streams, 1525-1830 m

Malesia (Papua New Guinea, endemic).

Papua New Guinea (Morobe Province)

Cool growing epiphyte.

February, April, May.

  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Vandeae
  • Subtribe Aeridinae
  • Genus Cleisostoma
  • Species Cleisostoma clemensiae

Cleisostoma clemensiae seems most similar to C. gjellerupii but differs in the paniculate (not simple) inflorescences, flowers devoid of calli on the outside at the junction of the midlobe and sidelobes, and the midlobe has an obliquely (not evenly) triangular basal callus.
(after Ormerod 2008)

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Cleisostoma clemensiae

Cleisostoma clemensiae Ormerod. Drawing by Paul Ormerod in Orchadian 16 (2008 ) 82, fig., after the type:: M.S. Clemens 12203A