I second this. H&R is the registrant of your Dendrobium so they would be the "source."

H&R Nurseries

If you want a similar, Clown Alley Orchids is great. John is a judge and comes to our May show every year. I ordered a bunch of Formosae types from him last year and when he brought them to the show, they were HUGE for the price.

Dendrobium Orchids at Clown Alley Orchids