The velamen is of the Bulbophyllum type. The pseudobulbs have single internodes.
Usually there is a prominent stelidium. The rostellum is shelf-like, truncated and fleshy.
The viscidium is semi-fluid, straight, sometimes very large. In some species of Saccoglossum and Bulbophyllum there is a small, finger-like hamulus.
There are usually four pollinia, of various sizes depending on the species, but sometimes only two.