To confirm the registration of an Australian native hybrid & view its composition/progeny: (Database as at 1st April 2018 RHS registrations)
For non-Australian Dendrobium hybrids use the Dendrobium Hybrids checklist here
Sarco. Hot Ice= Cherie x Heidi ( has 12 hybrid progeny ) registered: 26/05/1998 by Clement R. -Batchelor S.
Species composition summary:
Sarco. Hot Ice = Cherie x Heidi = [Fitzhart x fitzgeraldii] x [Fitzhart x hartmannii]
Fitzhart = hartmannii x fitzgeraldii