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Thelasis angustifolia

Thelasis angustifolia

Thelasis angustifolia J.J.Sm., Nova Guinea 12, 4 (1916) 432, pl. 164, fig. 308

Type: Gjellerup 885 (holo BO; iso L)


  • Rhynchophreatia angustifolia (J.J.Sm.) Schltr., Bot. Jahrb. Syst. 56 (1921) 488

Stem short, densely 5-6-leaved. Leaves erect-patent, linear, at the apex narrowed, unequally minutely bilobulate with a thick short apicule or a long conical one dorsally between the lobules, at the base long petiolate-narrowed and conduplicate, angular-channelled, the sides convex, underneath obtusely convex and furfuraceous-punctate, somewhat fleshy, 2-9.5 by 0.17-0.4 cm; sheaths strongly dilated, in the basal part tubular and in front membranous, distally narrowed and with irregular margins, at the apex broader than the base of the leaf-blade and on either side forming an obtuse auricle, furfuraceous-punctate, 0.5-1 cm long. Inflorescences axillary, erect, at the apex laxly several-flowered; peduncle thin, 2.25-4.5 cm long; peduncle-scales small, c. 3, tubular, acuminate, above laterally flattened, keeled, acute, furfuraceous-punctate, to 0.55 cm long; rachis angular, furfuraceous-punctate, to 1.75 cm long. Floral bracts persistent, widely patent, initially appressed to the pedicel, at the base dilated and triangular, above linear-subulate-acuminate, concave, 0.16-0.27 cm long. Flowers very small, turned to all sides, 0.08-0.1 cm apart, without ovary 0.23 cm long. Sepals dorsally sparsely furfuraceous-punctate. Median sepal ovate, obtuse, concave, 1-nerved, 0.2 by 0.13 cm. Lateral sepals obliquely triangular, 0.24 by 0.18 cm, acute, concave, 1-nerved, with the mid-rib dorsally obtuse and prominent; mentum very short obtuse. Petals obliquely oblong, apiculate, 1-nerved, 0.17 by 0.08 cm. Lip concave, when flattened rhombic, weakly 3-lobed, below the middle broadly thickened, with a basal thickening, on either side delimited by a longitudinal concavity (nectary), convex below, below the middle slightly broadly channelled, 3-nerved, 0.24 by 0.15 cm; lateral lobes angular-semiorbicular; mid-lobe much larger, triangular, obtuse, apiculate. Column dorsally convex, 0.1 cm long, at the apex triangular, obtuse; clinandrium concave; rostellum porrect, 2-dendatum. Anther equalling the rostellum, cordate, acuminate, acute, 0.08 cm long. Ovary (when fertilised) subglobose-obconical, triangular, 3-ribbed, 0.23 cm long; pedicel with ovary sparsely furfuraceous-punctate, articulated above the base, 0.18 cm. long. (After Smith, 1916)

Flower light brownish yellow.

Epiphyte in lowland forest; 400 to 600 m.

Malesia (New Guinea).

Papua (Indonesia). See map

distribution map


  • Smith, J.J., Nova Guinea 12, 4 (1916) 432, t. 164, fig. 308
  • Family Orchidaceae
  • Subfamily Epidendroideae
  • Tribe Podochileae
  • Subtribe Thelasiinae
  • Genus Thelasis
  • Section Hemithelasis
  • Species Thelasis angustifolia

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Thelasis angustifolia

Thelasis angustifolia J.J.Sm., floral analysis, drawing J.J. Smith, from Gjellerup 857

Thelasis angustifolia

Thelasis angustifolia J.J.Sm., habit, drawing Natadipoera, from Gjellerup 857

Thelasis angustifolia

Thelasis angustifolia J.J.Sm., herbarium sheet, Gjellerup 885 (isotype specimen L)