At Peter Johnston workshop years and years ago in Sydney we were looking at a whole stack of Chlorociboria specimens. From what I can remember, I need to try and dig up my notes, we were finding more than the C. aeruginascens. My impression is that this is a name people know and so they call all their sightings by this name. Maybe a safe way around this would be to call them C. aeruginascens (group)!