Pleurothallis
The Pleurothallis orchids are one of the largest genera in the orchid family. There are a lot of other closely related genera of pleurothallids, mostly with similar care requirements (Masdevallia, Dracula, Porroglossum, Scaphosepalum, and Stelis).
Humidity: Most pleurothallids really like high humidity; 70% should be considered a minimum. Most originate originate in cloud forests in the Andes, where 100% humidity is not unusual.
Temperature: Though there is a great deal of diversity in this genus, most like cool temperatures that stay below 70°F (21C). If temperatures get too hot, they will quickly dry out, shrivel, and die; possibly in a matter of hours. The higher the light, the cooler the temperatures need to be, and vice versa.
Light: Most species like low-to-intermediate lighting (bright, indirect light).
Water: Most pleurothallids hate to dry out. Water as they approach dryness if you are able to provide plenty of humidity; keep them moist more consistently if the humidity is low.