Dockrillia linguiformis var. linguifomis (Thumbnail Orchid or Tick Orchid)

Stems creeping, much branched, 3-4mm thick.  Leaves appressed to host, alternate, 20 - 40 x 12 - 15mm, tongue-shaped, thick, fleshy, dark green, furrowed, smooth.  Racemes erect, conspicuous; flowers white with yellow labellum callus.  Racemes 60 - 150mm.  Flowers 5 -20 x 8 - 13mm across.  Also called Dendrobium linguiforme var. linguiforme.