Plant: leaf sessile, heart-shaped 20-30x 15-20mm.

Flowers: Flower short stalked above the leaf. Labellum blackish crimson, dorsal sepal with greenish flecks, much longer than labellum. Labellum an almost straight horizontal tube on young flowers but the tip drops down a little at maturity, holding the point well clear of the ovary.

Flowering: October to November.

Habitat: wet, mossy, shady stream banks. Northland.

Conservation: naturally uncommon, sparse.

Notes: The name Corybas rivularis was formerly used for Corybas acuminatus or confused with other species such as those in the Wet Places group.

Key features: the dark, almost bell shaped labellum is quite distinct.