weird, in the web I found pics of both Dgmra. Mem. Jay Yamada and Dgmra. Jay Yamada... whether they are the same hybrid, but there is a typo in the website... dunno!
http://www.orchidsinourtropics.com/u...JAY_YAMADA.jpg
http://www.clownalleyorchids.com/Dgmra.%20Mem.%20Jay%20Yamada%20'Kauai'%20500.jpg
Olomana Orchids: Dendrobium Hybrids, Hawaii Orchid Nursery
Anyway, neither one of them is registered in RHS. The most similar thing I could fnd there is Aliceara Mem. Jay Yamada, which I just found here
www.wildcattdata.com/NewWeb/OncidChanges.rtf it is the new name for this hybrid. with that, you can go back to RHS and check for the parentage