To confirm the registration of a Dendrobium hybrid & view its composition/progeny: (Database as at 1 January 2018 RHS registrations)
Den. Crimson Gem = Celebrity x Crimson Fan Registration: 1983 by Kushima H.
Choo Yon Sen = Enduring Friendship 2017 Singapore Bot. Gdns
Crimson Fan = Crimson Gift 1992 Kushima H.
Fuchs Blue Angel = Ess Kushima 1991 Kushima H.
Harold Kushima = Crimson Glory 1991 Kushima H.