Nematanthus corticola GS07
Photo by Ron
Grown by Frank Rouse
Shown at the 2007 Convention of The Gesneriad Society. This photo nicely illustrates the long pedicels for which this species (and several other Nematanthus) are known. Other photos can be seen here and here.
Other Nematanthus with a similar dangling flower habit include N. crassfolius, and N. brasiliensis.