Arthrochilus rosulatus D.L.Jones

Rosette encircling base of inflorescence; leaves 3 or 4, elliptical, 10–35 × 8–12 mm, bluish green. Flower stem 70–150 mm tall, 2–15-flowered. Flowers 8–13 mm long, pale green with thickly clubbed, reddish to brownish labellum glands. Dorsal sepal 7.5–9 × 2 mm. Lateral sepals 5.5–6.5 × 2 mm. Petals 5.5–6.5 × 1 mm. Labellum stalk c. 4 mm long. Labellum lamina c. 5 × 0.8 mm, pale green with purple basal blotch; free basal part of labellum c. 2 mm long. Callus c. 3 mm long; central area with shiny, thick, clubbed calli 0.6–1.2 mm long; margins densely covered with similar calli; limb of callus c. 1.5 mm long, apex broadly notched, c. 1.5 mm wide, with shiny, dark reddish or blackish warts.

Scattered, generally uncommon and often in small colonies; growing in deep freely draining sandy soil and laterite in open forest; occasionally on slopes among granite boulders.