Cryptostylis concava Schltr., Repert. Spec. Nov. Regni Veg. 16 (1919) 42
Type: Kempf s.n. (Waria area, border between German and English New Guinea) (holo B, lost)
Terrestrial, erect, 25 cm high. Roots fascicled, somewhat fleshy, finely villose. Leaves basal, two in the specimen seen, erect, petiolate, blade elliptic, shortly acuminate or apiculate, at the base cuneate, 6.5-7.5 cm long, near the middle 2.7-3 cm wide; petiole slender, channelled, 2.5-4 cm long. Inflorescence erect, substriate, with c. 5 clasping, acuminate, distant scales, terete, glabrous, 0.2 cm diam., rather laxly 6-9-flowered. Floral bracts ovate-lanceolate, acuminate, much shorter than the ovary. Flowers several not resupinate. Sepals linear-ligulate, acute, 1.3 cm long, glabrous. Median sepal deflexed. Lateral sepals suberect, oblique. Petals subpatent, lanceolate-linear, acuminate, falcate-patent, 0.6 cm long. Lip erect, at the base reniform-concave, strongly contracted; blade elliptic-oblong, concave, acuminate, almost glabrous, 0.9 cm long, near the middle 0.35 cm wide, in the basal half with a high median keel; lip in total 1.3 cm long, when flattened just above the base 0.5 cm wide, in the apical half of the hypochile with a short, rather thick double keel. Column very short, rather thick, clinandrium low, scarcely higher than the stigma. Ovary subsessile, subfusiform-cylindrical, glabrous, 1.2 cm long. (After Schlechter, 1919).