Biermannia calcarata Averyanov Bot. Zhurn. (Moscow & Leningrad). 73: 429. 1988.

胼胝兰 pian zhi lan

Stems ca. 5 mm, base with several fleshy roots. Leaves basal, 4 or 5, oblong-lanceolate, 3-5 × ca. 1 cm, unequally bilobed. Inflorescence pendulous, 5-12 mm, 3-6-flowered; peduncle and rachis slightly flattened; floral bracts 1-3 mm. Flowers small, pale yellow, lip mid-lobe white; pedicel and ovary 3-5 mm. Sepals similar, elliptic-lanceolate, ca. 9 × 3 mm, dorsally carinate, cuspidate-acuminate. Petals similar to sepals, ca. 8 × 2.5 mm, acuminate; lip 3-lobed; lateral lobes erect, ovate-triangular, ca. 1 × 0.5 mm; mid-lobe spreading horizontally, conic-cucullate, ± slipper-shaped, ca. 6 × 2 mm, fleshy, obtuse; pouch oblong-cylindric, ca. 2 × 1.5 mm, slightly trifid-tipped. Column ca. 2 mm; stipe ca. 0.5 mm. Fl. Jul-Sep.

Epiphytic on trees in forests; ca. 800 m. SW Guangxi [Vietnam].