Medium sized terrestrial. Leaves 4 or 5, elliptic, to 22 cm long, to 5 cm wide, mottled silver-green and dark green. Flowers solitary or rarely 2, to 7.5 cm wide; winter. Dorsal sepal ovate, wider than laterals, white with green veins. Petals oblong, longer and narrower than dorsal sepal, spreading, white with green veins often with purplish suffusions and/or blackish warts. Labellum helmet-shaped, brownish with green veins.
NE India, Nepal and Bhutan.
P. acmodontum M.W. Wood from the Philippines is a compact epiphyte with mottled leaves, solitary, mostly white or pink flowers with green markings and purplish stripes and suffusions, dorsal sepal wider than petals, and an olive-green, helmet-shaped labellum.
P. lawrenceanum (Rchb. f.) Pfitzer from Borneo is a compact terrestrial with mottled leaves, solitary whitish flowers with green markings and heavy purplish suffusions and veins, dorsal sepal very large and much wider than petals and a purplish-brown, helmet-shaped labellum.
Source: (2005). Orchidaceae. In: . Horticultural Flora of South-eastern Australia. Volume 5. Flowering plants. Monocotyledons. The identification of garden and cultivated plants. University of New South Wales Press.
