Flowering plant 8–13 cm tall, scape thick, stem leaves 3–5, closely sheathing. Rosette leaves 5–7, ovate to elliptic, 0.8–2 cm long, 4–11 mm wide, shortly petiolate, crowded, margins entire. Flowers 5–12, crowded, 8–10 mm long; galea porrect at base, shallowly curved for most of its length, abruptly decurved near the apex; dorsal sepal acute; lateral sepals deflexed, conjoined part broadly ovate in outline when flattened, 4–5 mm long, 5–6 mm wide, margins incurved, concave, free points broadly triangular, c. 3 mm long, spreading; petals asymmetrical, ovate, broadest towards the middle. Labellum green with a greenish black basal appendage; lamina oblong-elliptic, 2–2.3 mm long, c. 2 mm wide; appendage c. 1.5 mm long, c. 0.8 mm wide, 3-ridged, central ridge thick, higher than marginal ridges. Flowers Sep.–Oct.
Easily confused with Pterostylis bicolor, but that species is generally more robust with more widely spaced non-overlapping flowers. The closely related P. agrestis generally has a thinner scape and larger labellum appendage with a less elevated central ridge.
Apparently not collected for over 100 years and presumed extinct.
