orchid id pls (no flower)

[dsim]

there's no flower. this new plant (with 2 leaves) has grown from the parent plant about 6-8 months ago. the parent plant is left with a "pseudobulb" now - no more leaf.

the roots are dark red in color and have very fine "hair". however, this young plant is growing very slow (compared to my other dendrobiums) - and the root is slow too.

i never seen the flower. not sure what species this is. any close id is appreaciated - so that i know how to care for it. now it is hanging in a wooden basket under a tree.