During our recent visit to Borneo we saw a number of warm growing Coelogyne species in large trees such as the photo below.
The plants are growing in shade on the lower branches of trees close to a limestone cliff.
Coelogyne speciosum is native to Malaysia, Borneo, Java and Sumatra where it is reported from 700-2000m altitude. This variety has more white on the lip than is usual and a light green flower colour where the more usual colour is variations of yellow and brown.
We grow the species in Warm Asia (min 18C) although its range indicates that it could be grown cooler. Each short flower stem produces two or three flowers that bloom successively over several months and on a large plant can give a very impressive display
We keep the species well watered throughout the year. It produces the odd flower at anytime through the year but the main flowering is in the summer.
The large hairy lip is well worth a close inspection. The species is probably pollinated by large bees.