To confirm the registration of an Australian native hybrid & view its composition/progeny: (Database as at 1st January 2020 RHS registrations)
For non-Australian Dendrobium hybrids use the Dendrobium Hybrids checklist here
Sarco. Lorna= Redstone x hartmannii registered: 20/11/2003 by Roper N.
Species composition summary:
hartmannii 62.5% fitzgeraldii 31.3% ceciliae 6.3%
Sarco. Lorna = Redstone x hartmannii = [Cherie x Elizabeth] x hartmannii
Elizabeth = Lois x fitzgeraldii = [ceciliae x hartmannii] x fitzgeraldii
Cherie = Fitzhart x fitzgeraldii = [hartmannii x fitzgeraldii] x fitzgeraldii