Angela turns our attention to something so obvious we seem to have overlooked it! It is certainly a very unusual Den, if it really is one: the canes (pseudobulbs) are extremely shortened: so that the internodes are almost eliminated, bringing the leaves very close together. Not knowing the genus well, I just assumed it was a Dendrobium I had never seen or been aware of. But it is certainly atypical, to put it mildly! Maybe it is a random mutation preserved by a puzzled breeder? Come on all you Den fans out there: tell us what is going on here!