I've had this one for almost 2 years, it seems to bloom just about every other month. Probably my most frequent bloomer. Flowers form very quickly, I rarely notice a spike until the flower is about to open or already open. Flowers are also quite small, about 5mm.
The flower is upside down, I cannot remember if it always forms that way.
2011-04-09 Dendrobium lichenastrum var. prenticei - 001 by
keenspace, on Flickr
2011-04-09 Dendrobium lichenastrum var. prenticei - 002 by
keenspace, on Flickr