Pabstia viridis does show a pseudobulb much like the yours Myriam, look at the left pseudobulb. The flowers are gorgeous, as you know I love green flowers!
http://commons.wikimedia.org/w...
https://orchid.unibas.ch/phpMy...
Pabstia jugosa is illustrated on plantillustrations, the pseudobulbs look smooth, so do those on Pabstia placanthera. This type of bulb does wrinkle with age but yours are new growth and the ridging isn't wrinkling.
http://plantillustrations.org/...
It's a shame it wasn't in flower!
