Pterostylis tenuissima

Flowering plant to 30 cm tall, stem very slender, stem leaves 4–7, loosely sheathing to spreading. Rosette leaves 3–6, ovate, 3–20 mm long, 2–7 mm wide, petiolate, margins entire. Flower 1.2–1.5 cm long, translucent white with dark green stripes and suffusions. Dorsal sepal with decurved filiform point 10–15 mm long; petal margins narrow, not flared; lateral sepals erect, tightly embracing the galea, sinus broadly v-shaped when viewed from the front, protruding in a prominent bulge when viewed from the side, free points to 2–2.5 cm long, filiform, erect or lax. Labellum narrowly ovate-lanceolate, 6–8 mm long, 1.5–2 mm wide, dark brown, curved, the distal third protruding from the sinus in the set position. Flowers Oct.–Mar.