Prasophyllum fosteri D.L.Jones

Plants 200–300 mm tall. Free part of leaf to 150 × 3–7 mm. Spike 60–120 mm long, 10–25-flowered. Ovary shortly stalked, green. Flowers well-spaced to moderately crowded, lightly scented, 12–14 × 5–7 mm, greenish to reddish brown, labellum cream to greenish, callus green. Dorsal sepal 7–8 × 3–3.5 mm, decurved or recurved. Lateral sepals free, 7–8.5 × 2–2.5 mm, nearly parallel. Petals linear to obovate, 6–7 × 1.6 mm, upswept, blunt. Labellum shortly stalked, broadly ovate, 5–6 × 4.5–5 mm, sharply recurved near middle, green to brownish, sharply tapered from near middle to apex, margins lightly crinkled. Callus broad, fleshy, shiny, with short apical tail, extending nearly to labellum apex.

Restricted to a single locality where it grows among grasses and forbs in a small area of roadside grassland on well-structured, red-brown to blackish basalt loam.