Lithocarpus microspermus A. Camus subsp. mekongensis A. Camus, Chênes, Atlas 3: 116. 1948.

Trees ca. 10 m tall. Petiole less than 1 cm; leaf blade elliptic to ovate-elliptic, 10-15 × 4-5 cm, papery, abaxially with waxy scalelike trichomes and glaucous when dry, adaxially glabrous, base cuneate, margin entire, apex acuminate; secondary veins 12-15 on each side of midvein, apical ones fusing near margin; tertiary veins abaxially slender, evident. Male inflorescences solitary, axillary, 8-15 cm; rachis scurfy, puberulent, or glabrous. Female inflorescences 8-15 cm; cupules of ca. 3, sometimes solitary. Infructescence rachis 5-6 mm thick, lenticellate; lenticels small. Cupule bowl-shaped, 3-5 mm × 1-1.2 cm, enclosing basal part of nut; bracts imbricate, triangular, small. Nut depressed globose, 5-8 mm × 1.1-1.4 cm, sparsely puberulent, apex ± flat or sometimes concave; scar ca. 6 mm in diam., concave. Fl. Oct-Dec, fr. Aug-Oct of following year.

Broad-leaved evergreen forests, frequent on dry slopes; circa 1000 m. S Yunnan [Laos, Vietnam]