are Pleurothallis and Odontioda both types are orchids?
Pleurothallis Pleurothallis, abbreviated Pths in horticultural trade, is a genus of orchids commonly named bonnet orchids. The genus name is derived from the Greek word 'pleurothallos', meaning 'riblike branches'. This refers to the rib-like stems of many species.
Epidendrum tridens Epidendrum tridens ("the three-toothed "Epidendrum"") is a terrestrial orchid closely allied to "E. nocturnum", of which it has often been considered a variety or synonym. For example, Reichenbach 1861 lists "Epidendrum tridens" as a synonym of "Epidendrum nocturnum" and "Epidendrum nocturnum" var. "latifolium" as a distinguishable variety of "Epidendrum nocturnum".