Disperis decipiens Verdc., Kew Bull. 30: 605 (1975 publ. 1976).
Description:

Plants mostly 120 mm. Leaves 2, alternate, ovate, 5-22 × 3-15 mm. Flower 1, white; median sepal 5 mm long, lateral sepals naviculate, 5-6.5 × 2-3 mm; petals lanceolate, 5-5.5 × 1-1.5 mm; lip only basally fused to gynostemium, lanceolate, 4-5.5 mm long, without appendage. The absence of the lip appendage in this species is probably due to secondary loss.
Habitat:

In forests and cypress plantations at 1700 m. Flowering in April and May.
Distribution:

Tanzania