Leaves 20–50 × 10–15 mm, often only partially developed at flowering time, margins usually crinkled. Flower stem 50–80 mm long, usually pinkish. Flower obliquely erect to erect, 22–32 × 6–12 mm, greenish bronze to pinkish; labellum calli mostly blackish; column green or speckled with red. Dorsal sepal narrowly spathulate, 10–16 × 3–4 mm; apical club 2–3 mm long. Lateral sepals decurved, 10–18 × 0.7 mm, not usually recurved beneath labellum; apical clubs 3–5 mm long, often thickened, dark red. Petals reflexed against ovary, 8–11 × 3–3.5 mm. Labellum held horizontally, trapezium-shaped, 9–11 × 6–7 mm, with a short decurved tail. Callus resembling a large ant, occupying most of upper labellum surface; main stalked gland in line with rest of calli (not extending higher than rest), notched, flanked by numerous long-stalked, clubbed glands with a series of stalkless glands extending as a narrowing tail nearly to labellum apex. Column 7–9 × 2.5 mm.
Widespread and common; ranging from lowlands to montane areas. Found growing among shrubs and bracken in heathland, heathy forest, stunted forest, shrubby forest and montane forest in freely draining to moisture-retentive sandy soils, gravels and clay loam.
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