Pterygodium magnum floral bracts present varying degrees of sagging or reflexing among the flowers in picture. They taper to acutely pointed tips protruding further than the flowers.
The sepal colouring is matched on the bracts. The sepal surface is concave, its outline ovate to elliptic, attenuating to an acute tip. The laterals are oblique, the odd one symmetrical. The dorsal sepal curves forward over the lateral petals forming the hood, the lateral ones spreading sideways and forward below the flower centre.
The lip is mottled white, about 6 mm long, the lip appendage erect. There is no spur. The yellowish, fringed petals have purple spots and streaks. The petals become up to 1 cm long (Pooley, 1998; www.africanorchids.dk).