Well. AOS’s new awards search program, OrchidPro, identifies three awarded dalessandroi (and no besseae f. or var. dalessandroi).
The AOS has a judging handbook task force that has proposed officially incorporating reference to the World Checklist of Selected Plant Families (Kew) as its primary source for species nomenclature. This is part of a number of proposals that are pending review and adoption, but my (limited) understanding is that this is the currently preferred practice. Right now there is no section in the judging handbook on accepted nomenclature authorities.