nice one, dalessandrio x longifolium, the other variations years ago were mistaken for Eric Youngs and we got some confussion in the crosses made with them
If you're in Canada or UK, well actually, anywhere BUT the USA the plants you got were could have been Nichole Towers. The only people I know had dal hybrids (from EYOF) before were Glen Decker and Paul from Ratcliffe/Orchid World. and I dont think x longifolium was one of them. Yay besseae hybrids!