Appendicula cornuta

This species occurs over a wide elevational range (sea level to 2000 m) and in many countries in SE Asia (Guangdong and Hainan provinces of China, Hong Kong, Assam, Eastern Himalayas, Myanmar, Thailand, Cambodia, Vietnam, Borneo, Java, Malaysia, Philipines, Sulawesi and Sumatra), and likely can be grown hot to cool. It is a small to medium sized species. 

Here is a link to photos and more details on Jay's Internet Orchid Encyclopedia.