Acianthus fornicatus

Flowering plant 6–15 cm tall. Leaf cordate, thin, 1.5–4 cm long, 1–2.5 cm wide, green above, reddish-purple beneath, entire or margin sometimes shallowly lobed proximally. Flowers 2–11, translucent pink and green with a green or green and maroon labellum; pedicel (including ovary) c. 5 mm long, subtended by an ovate bract about half as long; dorsal sepal ovate, cucullate, 9–12 mm long including apical point c. 2 mm long, smooth or very nearly so; lateral sepals projected obliquely forwards, usually slightly divergent and/or recurved, linear to linear-lanceolate, 9–12 mm long, apical point c. 2 mm long; petals spreading widely, linear-ovate to lanceolate, 3.5–5 mm long. Labellum on short claw, slightly decurved distally, oblong-ovate to cordate, 5–6 mm long, 2.5–3 mm wide, distal margins slightly recurved, irregularly serrulate; apex acute; callus thick, fleshy, densely papillose towards the apex. Column incurved, almost terete, not winged. Flowers Jun. (1 record).