Stolzia williamsonii P.J.Cribb, Kew Bull. 33: 88 (1978).
Dwarf, creeping epiphytic herb. Pseudobulbs prostrate, elongate, 2–4 cm long, swollen at one end, 2-leaved.Leaves 10–30 × 5–8 mm, elliptic or obovate, rounded at the apex, thin-textured, articulated c. 1 mm above apex of the pseudobulb, one leaf of the pair usually larger than the other. Flowers solitary; peduncle c. 3 mm long; bract 1.5 mm long, ovate, acute. Flowers red-brown, non-resupinate. Dorsal sepal 8.5 × 3 mm, concave, elliptic, obtuse, not recurved towards the apex; lateral sepals similar but oblique and slightly shorter, united in the basal third, forming a saccate mentum 2–2.5 mm high. Petals 7 × 2 mm, adnate to the dorsal sepal, ovate-elliptic, obtuse, papillose. Lip recurved, 3.5 × 1.2 mm, lanceolate-ligulate, acute or acuminate, papillose with an erose margin. Column 0.5 mm long; column-foot 2 mm long.
Submontane forest, forming mats on mossy branches of trees c. 2350 m.
Rwanda to N. Malawi